作物学报2017，Vol.43Issue(2)：226-237,12.DOI:10.3724/SP.J.1006.2017.00226
根-冠互作对棉花叶片衰老的影响
Effect of Root-shoot Interaction on Cotton Leaf Senescence
摘要
Abstract
Researches and practices associated with grafting indicate that the diversity of root-shoot interaction is universal in different physiological processes of plant. Our previous grafting study with CCRI41, an early senescence cotton cultivar, and SCRC22, a late senescence cultivar as materials found that shoot played a major role in mediating leaf senescence of cotton. In the present study, CCRI41 and another late senescence cotton cultivar CCRI49 were used to do standard grafting (I-grafting, one scion grafted onto one rootstock) and Y-grafting (two scions grafted onto one rootstock). Leaf senescence of grafts was induced by low potassium (K; 0.03 mmol L–1). Contrary to the grafting combination of CCRI41 and SCRC22, the combination of CCRI41 and CCRI49 showed that the role of root was more important than that of shoot for leaf senescence, as characterized by SPAD reading. Accordingly, the concentration of ZR+Z or iPA+iP in roots and the youngest fully expanded leaf and their delivery rate in xylem sap regarding I-grafting combinations with CCRI41 as rootstock were significantly lower than those with CCRI49 as root-stock in most of situations. However, the results of free ABA level were exactly opposite. With respect to the Y-grafting of CCRI41 and CCRI49, the results were similar to those of I-grafting, whereas the role of root was not absolutely predominant any more. The mechanism for different root-shoot interactions in cotton leaf senescence was discussed from the perspective of root-shoot-root distance communication.关键词
棉花/嫁接/叶片/衰老/根-冠互作Key words
Cotton/Grafting/Leaf/Senescence/Interaction of root-shoot引用本文复制引用
张巧玉,王逸茹,安静,王保民,田晓莉..根-冠互作对棉花叶片衰老的影响[J].作物学报,2017,43(2):226-237,12.基金项目
本研究由国家自然科学基金项目(31271629)资助。This study was supported by the National Natural Science Foundation of China (31271629) （31271629）
