Exogenous 6-benzylaminopurine enhances waterlogging and shading tolerance after anthesis by improving grain starch accumulation and grain filling

• DOI: 10.3389/fpls.2022.1003920
• Publication Date: 2022-10-27T06:12:09Z
• Authors: Wenjing Zhang; Beibei Wang; Anmin Zhang; Qirui Zhou; Yang Li; Lingyu Li; Shangyu Ma; Yonghui Fan; Zhenglai Huang
• Keywords: Anthesis; Waterlogging (archaeology); Stomatal Conductance; Shading

Due to the frequent occurrence of extreme weather events, area wheat affected by continuous cloudy rainfall is increasing, with waterlogging becoming a major limiting factor yield. To alleviate effect, spraying exogenous plant growth regulators often used. In this study, two cultivars, waterlogging-tolerant Yangmai 18 and waterlogging-sensitive Sumai 188, were selected for shading (WS) after anthesis 7, 11, 15 days respectively. Three concentrations 6-benzylaminoadenine (6-BA) solution (15, 25, 35 mg·L-1) sprayed WS treatment water was as control. Then, effect 6-BA on photosynthetic characteristics, starch content, grain filling yield explored under artificially stimulated during anthesis. Compared control, application caused significant increase in plumpness throughout filling, well increases net rate (Pn), stomatal conductance (Gs), transpiration (Tr), decrease intercellular CO2 concentration (Ci) flag leaves, all which enhanced capacity. The content total starch, amylose, amylopectin grains also increased significantly compared After days, 3.81%-11.41% Spraying prolonged average rate, 1000-grain weight thousand-grain 5.06%-43.28%, 8.93%-64.27% 25 mg·L-1 solution. These findings suggest that stress could improve performance, propitious accumulation transport products Besides, can duration weight, thereby alleviating adverse effects Overall, had an optimal effect. provide theoretical basis exploration cultivation techniques measures aimed at damage