作物学报2018，Vol.44Issue(1)：126-136,11.DOI:10.3724/SP.J.1006.2018.00126
不同时期干旱胁迫对甘薯内源激素的影响及其与块根产量的关系
Effects of Drought Stress at Different Growth Stages on Endogenous Hormones and Its Relationship with Storage Root Yield in Sweetpotato
摘要
Abstract
Field experiments were conducted under a rain exclusion shelter using two sweetpotato (Ipomoea batatas (L.) Lam) cultivars (Jishu 21, drought-tolerant, and Jizishu 1, drought-sensitive) with four drought stress treatments during the whole growth period (DS), root branching stage (DS1), the intermediate stage (storage root initiation) (DS2), and the final stage (storage root bulking) (DS3). A separate well watered experiment was as a control (WW). Compared with the control, the fresh and dry weight of two cultivars in all treatments decreased significantly in three years. The dry weight of DS treatment had the highest decrease, with an average of 44.62％ and 56.21％ for Jishu 21 and Jizishu 1, respectively. The impact of DS1 was the second, with an aver-age decrease of 32.03％ and 44.03％ for Jishu 21 and Jizishu 1, respectively, followed by DS2, with an average decrease of 30.41％ and 39.39％, respectively. The impact of DS3 was the lowest, with an average decrease of 13.66％ and 17.88％, respec-tively. The impact of drought stress on dry weight of Jishu 21 was lower than that of Jizishu 1. The drought stress significantly inhibited the growth of aboveground part, and the formation and bulking of storage roots. Number of leaves per plant, vine length, dry weight of aboveground and underground parts, and starch content were decreased under drought stress, compared with the control. DS had the highest impact, followed by DS1 and DS2; DS3 had the lowest impact. GA, IAA, and ZR contents in leaves and roots of both cultivars decreased, while ABA content increased. There were significant positive correlations between dry weight of aboveground part and GA, IAA, and ZR contents in leaves, dry weight of underground part and GA, IAA, and ZR con-tents in storage roots. However, ABA content in leaves and storage roots was negatively correlated with dry weight of above-ground part and underground part, respectively. In summary, drought stress applied during different growth stages reduced the yield of fresh and dry roots. The earlier the application of drought stress, the greater influence on levels of endogenous hormones and storage root yields. Root branching stage of sweetpotato is most sensitive to drought stress.关键词
甘薯/干旱胁迫/内源激素/产量Key words
sweetpotato/drought stress/endogenous hormone/yield引用本文复制引用
张海燕,段文学,解备涛,董顺旭,汪宝卿,史春余,张立明..不同时期干旱胁迫对甘薯内源激素的影响及其与块根产量的关系[J].作物学报,2018,44(1):126-136,11.基金项目
本研究由国家现代农业产业技术体系建设专项(CARS-10-B08), 山东省薯类产业创新团队项目(SDAIT-16-09), 山东省重点研发计划项目(2016GNC111002)和农业部黄淮海薯类科学观测实验站资助.This study was supported by the China Agriculture Research System (CARS-10- B08), Shandong Province Modern Agricultural Technology System Tubers and Root Crops Innovation Team (SDAIT-16-09), Shandong Province Key Research and Development Project (2016GNC111002), and Scientific Observing and Experimental Station of Tubers and Root Crops in Huang-Huai-Hai Region, Ministry of Agriculture, P. R. China. （CARS-10-B08）
