Performance of wheat crops with different chromosome ploidy: root-sourced signals, drought tolerance, and yield performance
Performance of wheat crops with different chromosome ploidy: root-sourced signals, drought tolerance, and yield performance
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DOI：
10.1007/s00425-006-0252-x
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发表时间：
2006-02
期刊：
影响因子：
4.3
通讯作者：
Y. Xiong;Fengmin Li;Ting Zhang
中科院分区：
文献类型：
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作者：
Y. Xiong;Fengmin Li;Ting Zhang
通过盆栽实验来评估六个小麦品种在干旱胁迫下非水力根信号（nHRS）的作用以及这些信号与耐旱性和谷物产量形成的关系。其中包括两个现代六倍体小麦（Triticum aestivumL.，AABBDD）Plateau602和Longchun8139-2，两个二倍体小麦（Triticum monococcumL.，AB）MO1和MO4，以及两个四倍体小麦（Triticum dicaccum SchueblL.，AABB）DM22和DM31。在两个二倍体近缘种中，nHRS 在土壤含水量 (SWC) 约为田间持水量 (FWC) 53-45% 时打开和关闭。相比之下，在现代六倍体品种龙春8139-2和高原602中，nHRS发生在SWC约71％至35％FWC之间，土壤湿度范围更宽。两个四倍体亲属，DM22 和 DM31，通常是中间的。 SWC 中的 nHRS 阈值范围也缩小，因为所有六个品种都经历了从抽穗到灌浆的连续发育阶段。两个六倍体小麦品种在停水后的存活时间最长，干旱胁迫下产量稳定性最好，与四倍体小麦品种相似；二倍体小麦品种的健壮性最差。这两个参数均与 nHRS 土壤湿度阈值范围显着相关（r 分别为 0.9456** 和 0.8608*）。基于这些模式，我们提出了“三Z”模型来描述小麦生长中非水力气孔敏感性与土壤干旱的特征。
Pot-culture experiments were carried out to estimate the role of non-hydraulic root signals (nHRS) and the relation of these signals to drought tolerance and grain yield formation under drought stress in six wheat varieties. These were two modern hexaploid wheat (Triticum aestivumL., AABBDD)Plateau602andLongchun8139-2, two diploid wheat (Triticum monococcumL., AB)MO1andMO4, and two tetraploid wheat (Triticum dicoccum SchueblL., AABB)DM22andDM31. In the two diploid relatives, the nHRS was switched on and off at a soil water content (SWC) of approximately 53–45% field water capacity (FWC). In contrast, in the modern hexaploid varieties,Longchun8139-2andPlateau602the nHRS occurred between a SWC of about 71 and 35% FWC, a much wider soil moisture range. The two tetraploid relatives,DM22andDM31, were generally intermediate. The nHRS threshold range in SWC also narrowed as all six varieties went through successive developmental stages from shooting to grain filling. The two hexaploid wheat varieties had the longest duration of survival after the water supply ceased, and the best yield stability under drought stress, similar to with tetraploid wheat varieties; the diploid wheat varieties were least robust. These two parameters were both significantly correlated with the nHRS soil moisture threshold range (r=0.9456** and 0.8608*, respectively). Based on these patterns, we propose a ‘triple Z’ model to describe the features of non-hydraulic stomatal sensitivity versus soil drought in wheat growth.