| 1 | Effect of mini-cutting size on adventitious rooting and morphophysiological quality of Ilex paraguariensis plantlets显示文摘As the energizing and therapeutic effects of infusions of mate(Ilex paraguariensis A.St.-Hil)leaves are increasingly recognized,rising global consumption is also increasing the demand for plantlets with high genetic and morphological qualities.Mini-cuttings are an alternative for clonal plantlets;however,more details are needed on factors that affect the success of this technique.Here,toward maximizing production,we evaluated adventitious rooting competence of mini-cuttings of different sizes and the morphophysiological quality of the resultant plantlets.Small(one bud;length up to 2.5 cm),medium(multiple buds;length 2.6–5.0 cm),and large(multiple buds;length 5.1–10.0 cm)mini-cuttings were planted in a mixture of commercial substrate,vermiculite,and coarse sand(1:1:1 v:v:v),grown in a humidity chamber,then evaluated after 45,60,75,and 90 days for survival,percentage of callus and shoot formation,number and length of shoots,percentage of rooted cuttings,and number and length of roots.Any rooted mini-cuttings were then cultivated in commercial substrate and subsurface soil(2:1 v:v)and evaluated after 30,60,90 and 120 days of cultivation for morphophysiology of the plantlets,percentage of survival,number of leaves,shoot height,stem diameter,and ratio of shoot height to stem diameter.After 120 days,the plantlets were evaluated for the ratio of shoot and root dry mass,total length,surface area,total volume,and mean diameter of roots and Dickson quality index.Adventitious rooting of the mini-cuttings and the morphophysiological quality of the plantlets were not influenced by the size of the vegetative propagule.Therefore,single-bud mini-cuttings have similar adventitious rooting competence,and result in plantlets with adequate morphophysiological quality,based upon leaf development,shoot height,stem diameter and length,and surface area,volume and diameter of roots.Single-bud mini-cuttings up to 2.5 cm long can thus be used to maximize production of mate plantlets by mini-cuttings. | Nathalia Pimentel Denise Gazzana Janaina de Fatima Spanevello Kelen Haygert Lencina Dilson Antônio Bisognin | 2021 | Journal of Forestry Research2021，32，2： | 3 |
| 8 | 肺动脉高压患者肠道菌群变化显示文摘肺动脉高压(pulmonary arterial hypertension,PAH)被认为是一种肺血管疾病。尽管付出了巨大的努力,但在防止或阻止PAH进程方面进展有限。研究者之前的研究表明,PAH可以被认为是一种全身性疾病,因为它的病理涉及多个器官的相互作用。这一点,再加上已证实肠道及其微生物群在慢性病发病中的作用越来越大,研究者假设PAH患者可能表现出存在一种独特的肠道微生物群,这种肠道微生物群有可能导致并可预测疾病。研究者用shotgun基因组学法对18例1型肺动脉高压患者[平均肺动脉压(57.4±16.7)mm Hg,1mm Hg=0.133kPa]和13名正常对照者的粪便微生物组进行比较,以验证这一假说。 | 刘青(译) 叶鹏(摘/审校) Kim S Rigatto K Gazzana M B K norst M M Richards E M Pepine C J Raizada MK | 2020 | 中华高血压杂志2020，28，4： | 1 |
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