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| 1 | Improving water-use efficiency by decreasing stomatal conductance and transpiration rate to maintain higher ear photosynthetic rate in drought-resistant wheat显示文摘In wheat, the ear is one of the main photosynthetic contributors to grain filling under drought stress conditions. In order to determine the relationship between stomatal characteristics and plant drought resistance, photosynthetic and stomatal characteristics and water use efficiency(WUE) were studied in two wheat cultivars: the drought-resistant cultivar ‘Changhan 58' and the drought-sensitive cultivar ‘Xinong 9871'. Plants of both cultivars were grown in pot conditions under well-watered(WW) and water-stressed(WS) conditions. In both water regimes,‘Changhan 58' showed a significantly higher ear photosynthetic rate with a lower rate of variation and a significantly higher percentage variation of transpiration compared to control plants at the heading stage under WS conditions than did ‘Xinong 9871' plants. Moreover,‘Changhan 58' showed lower stomatal density(SD) and higher stomatal area per unit organ area(A) under both water conditions. Water stress decreased SD, A, and stomatal width(SW), and increased stomatal length in flag leaves(upper and lower surfaces) and ear organs(awn, glume,lemma, and palea), with the changes more pronounced in ear organs than in flag leaves.Instantaneous WUE increased slightly, while integral WUE improved significantly in both cultivars. Integral WUE was higher in ‘Changhan 58', and increased by a greater amount, than in‘Xinong 9871'. These results suggest that drought resistance in ‘Changhan 58' is regulated by stomatal characteristics through a decrease in transpiration rate in order to improve integral WUE and photosynthetic performance, and through sustaining a higher ear photosynthetic rate, therefore enhancing overall drought-resistance. | Yuping Li Hongbing Li Yuanyuan Li Suiqi Zhang | 2017 | The Crop Journal2017，5，3： | 18 |
| 2 | Change of water use efficiency and its relation with root system growth in wheat evolution显示文摘Raising crop water use efficiency (WUE) is the physiological basis to implement crop high efficiently using water. The present soil column and field experiments are designed to investigate the change of wheat WUE (Triticum aestivum L.) at whole plant level and root system growth in evolution and the relationship between WUE and its root system growth using 10 wheat evolution genotypes with different ploidy chromosomes sets. Results show that in wheat evolution from 2n→6n, WUE at whole plant level increases with the increase of ploidy chromosomes, and root system growth (root weight, root length) and root/shoot ratio of wheat decrease with the increase of ploidy chromosomes under dry and irrigated conditions. WUE is negatively correlated with root weight and root/shoot ratio of wheat in evolution, significantly. Root system growth has an adverse redundancy for WUE in wheat evolution, and the root redundancy reduces with the increase of ploidy chromosomes, which result in the increase of wheat WUE at | ZHANG Suiqi SHAN Lun DENG Xiping | 2002 | Chinese Science Bulletin2002，47，22： | 13 |
| 3 | Effects of dwarfing genes on water use efficiency of bread wheat显示文摘Climate change has increased the risk of drought, which significantly limits plant productivity.Various ways of increasing water availability and sustaining growth of crop plants in drought-prone environments are available. Genetic advances in grain yields under rainfed conditions have been achieved with the introduction of dwarfing genes. A thorough understanding of the effects of different dwarfing genes on root growth, coleoptile length, grain yields and water using efficiency(WUE) will provide opportunities to select appropriate Rht genes for breeding high WUE and grain yield cultivars. This review focuses on the mechanism involved in Rht genes that reduce plant height and affect root and coleoptile length, their consequent effects on grain yields and WUE, and suggests that for rainfed and irrigation-limited environments, combining GAR and GAI dwarfing genes in breeding may help boost WUE and yields, and more materials from different parental sources should be collected to assess opportunities for potential comprehensive application of specific Rht genes. | Jiakun YAN Suiqi ZHANG | 2017 | Frontiers of Agricultural Science and Engineering2017，4，2： | 3 |
| 4 | Advances in Biological Water-saving Research:Challenge and Perspectives显示文摘Increasing the efficiency of water use by crops continues to escalate as a topic of concern because drought is a restrictive environmental factor for crop productivity worldwide. Greater yield per unit rainfall is one of the most important challenges in water-saving agriculture. Besides water-saving by irrigation engineering and conservation tillage, a good understanding of factors limiting and/or regulating yield now provides us with an opportunity to identify and then precisely select for physiological and breeding traits that increase the efficiency of water use and drought tolerance under water-limited conditions, biological water-saving is one means of achieving this goal. A definition of biological water-saving measures is proposed which embraces improvements in water-use efficiency (WUE) and drought tolerance, by genetic improvement and physiological regulation. The preponderance of biological water-saving measures is discussed and strategies identified for working within natural resource constraints. The technology and future perspectives of biological water saving could provide not only new water-saving techniques but also a scientific base for application of water-saving irrigation and conservation tillage. | Lun Shan Xiping Deng Suiqi Zhang | 2006 | Science Foundation in China2006，14，2： | 2 |
| 5 | Heterosis for water uptake by maize (Zea mays L.) roots under water deficit: responses at cellular, single-root and whole-root system levels显示文摘To examine the potential heterosis for water uptake by maize roots, the hydraulic properties of roots in the F1 hybrid (Hudan 4) were compared with those of its inbred parents (♂ 478 and ♀ Tian 4) at cellular, single-root and whole-root system levels under well-watered and water-deficit conditions. The cell hydraulic conductivity (Lpc) decreased under water deficit, but the Lp c of the F1 was higher than that of its inbred parents with or without stress from water deficit. Marked reductions in Lp c were observed following Hg2+ treatment. The hydrostatic hydraulic conductivity of single roots (hydrostatic Lp sr ) varied among genotypes under the two water treatments, with the highest in the F1 and the lowest in ♂ 478. Radial hydraulic conductivity (radial Lpsr ) and axial hydraulic conductance (Lax ) of the three genotypes varied similarly as Lpsr . The variations in hydraulic parameters were related to root anatomy. Radial Lp sr was negatively correlated with the ratio of cortex width to root diameter (R2=-0.77, P<0.01), whereas L ax was positively correlated with the diameter of the central xylem vessel (R2 =0.75, P<0.01) and the cross-sectional area of xylem vessels (R2 =0.93, P<0.01). Hydraulic conductivity (Lpwr ) and conductance (Lwr ) of the whole-root system followed the same trend under the two water treatments, with the highest values in the F1 . The results demonstrated that heterosis for water uptake by roots of the F1 occurred at cellular, single-root and whole-root system levels under well-watered and water-deficit conditions. | XiaoFang LIU SuiQi ZHANG Lun SHAN | 2013 | Journal of Arid Land2013，5，2： | 2 |
| 6 | Minimal deviation adenocarcinoma of the uterine cervix显示文摘 | Guiling Li Wei Jiang Suiqi Gui Congjian Xu | 2010 | International Journal of Gynecology and Obstetrics2010，，： | 1 |
| 7 | Overcompensation or limitation to photosynthesis and root hydraulic conductance altered by rehydration in seedlings of sorghum and maize显示文摘In view of the prospect of irregular extremes of high and low rainfall due to climate change, the mechanisms underlying plant responses to periods of drought and re-watering need to be understood. Sorghum (Sorghum bicolor L.) and maize (Zea mays L.) were grown in pots of loess soil at three soil moisture levels to examine the effects of different levels of drought over 10 days and plant responses to re-watering (5 days of rehydration). Photosynthesis-related traits recovered rapidly both in sorghum and maize on re-watering, suggesting that photosynthetic function was not severely damaged after a short drought period, although the values of these traits were dramatically reduced during drought per se. However, the two species differed in the extent to which they recovered from severe stress. In sorghum, net photosynthetic rate (P_n), stomatal conductance (G_s), and maximum photochemical efficiency of PSII (F_v/F_m) returned to control levels after re-watering. However, in maize, these parameters exceeded control levels after re-watering. Both overcompensation and pre-drought limitation were observed. Over a range of growth conditions, close relationships between G_s and root hydraulic conductance (K_r) were observed in pooled data sets. P_n, K_r, and their related characteristics were compared among species and treatments. Our results showed that the recovery of K_r is similar between sorghum and maize, at least after a short time of re-watering, although the two species differ in drought-tolerance capacity. Our results also suggest that sorghum can endure moderate drought by adjusting certain traits, but is still as vulnerable as maize under severe drought stress. | Nan Wang Jing Gao Suiqi Zhang | 2017 | The Crop Journal2017，5，4： | 1 |
| 8 | Silicon-mediated changes in polyamine and 1-aminocyclopropane-1-carboxylic acid are involved in silicon-induced drought resistance in Sorghum bicolor L显示文摘 | Lina Yin Shiwen Wang Peng Liu Wenhua Wang Dan Cao Xiping Deng Suiqi Zhang | 2014 | Plant Physiology and Biochemistry2014，，： | 1 |
| 9 | Minimal deviation adenocarcinoma of the uterine cervix显示文摘 | Guiling L Wei J Suiqi G | 2010 | Int J GynecolObstet2010，110，： | 1 |
| 10 | Comparison of prechilling stratification and sulfuric acid scarification on seed germination of Panicum virgatum under drought stress显示文摘In semi-arid regions of the Loess Plateau,water deficiency restricts plant performance. Panicum virgatum(switchgrass), which is a highly versatile grass,had been introduced to the Plateau as a restoration species.To determine if prechilling stratification(PCS) and sulfuric acid scarification(SAS) can optimize establishment,P. virgatum cvs Pathfinder, Trailblazer and Alamo were tested under different ambient water potentials by measuring germination and root and shoot growth along water potential gradients under laboratory conditions. Both PCS and SAS improved total germination percentage(TGP), with PCS being more beneficial. The effect of PCS and SAS on mean germination time(MGT) weakened gradually with increasing drought stress. Both PCS and SAS showed no obvious effect on promoting root and shoot growth. Both PCS and SAS reduced base water potential requirement for reaching 50% germination of Pathfinder and Trailblazer, with this effect greater for PCS.These results indicate that embryo dormancy may be a major factor limiting germination of P. virgatum under drought conditions. Pathfinder appears to be more suitable for a semi-arid environment, whereas Alamo appears to be unsuitable for drought conditions. Given the large difference between predicted value and measured value,the reliability and applicable scope of linear regression estimated ψ_(50) needs further investigation, specification and optimization. | Nan WANG Jing GAO Suiqi ZHANG Feng YAN | 2017 | Frontiers of Agricultural Science and Engineering2017，4，2： | 0 |
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