作物学报 ›› 2023, Vol. 49 ›› Issue (10): 2705-2716.doi: 10.3724/SP.J.1006.2023.24261
朱继杰1(
), 王士杰1, 赵红霞1, 贾晓昀1(
), 李妙1(
), 王国印2
ZHU Ji-Jie1(
), WANG Shi-Jie1, ZHAO Hong-Xia1, JIA Xiao-Yun1(
), LI Miao1(
), WANG Guo-Yin2
摘要:
噻苯隆是棉花脱叶的主要化学药剂, 在实现棉花机械采收中发挥了关键作用。目前, 噻苯隆在大田环境下诱导棉花叶片脱落的分子调控机制研究较少。本研究以噻苯隆敏感型品种(冀丰914)和不敏感型株系(04-1685)为材料, 测定叶片的乙烯、细胞分裂素和脱落酸含量, 同时利用RNA-seq技术, 分析噻苯隆处理后0 d、1 d、3 d、5 d叶片的基因表达变化, 利用WGCNA (Weighted gene coexpression network analysis)分析筛选基因共表达模块, 利用GO和KEGG分析基因功能。结果表明, 冀丰914的乙烯、细胞分裂素和脱落酸含量在处理后1 d达到最高, 04-1685的激素含量在处理后3 d达到最高。通过RNA-seq筛选到33,283个差异表达基因(differentially expressed genes, DEGs), 通过WGCNA分析, 分别筛选到2个和3个与激素和样本高度相关的模块, 模块内的基因主要参与非生物胁迫响应、昼夜节律、物质代谢等过程。通过分析植物激素、胁迫响应、昼夜节律等主要过程相关基因的表达量发现, 激素相关基因在敏感型品种冀丰914中的表达量更高, 其中乙烯信号响应基因在处理后5 d内均保持在较高的表达水平, 脱落酸信号响应基因在处理后1 d内保持较高的表达水平, 细胞分裂素代谢相关基因在处理后1 d内表达量很低, 处理后3 d和5 d的表达量急剧增加。处理后1 d和3 d, 热激蛋白基因(HSP70、HSP90、ATJ3)、钙稳态调控基因(CRT3、NCL)和节律基因(LNK2、APRR9、CCA1)显著下调表达, 节律基因(ARR8)上调表达。大田环境下喷施噻苯隆, 在引起激素含量变化的同时, 可能破坏了植物的昼夜节律、降低对非生物胁迫的应激能力, 从而加速叶片衰老和脱落。本研究为丰富噻苯隆诱导叶片脱落的分子调控机制提供了更多思路。
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