Cotton shoot plays a major role in mediating senescence induced by potassium deficiency
Cotton shoot plays a major role in mediating senescence induced by potassium deficiency
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棉花芽在介导缺钾引起的衰老中发挥着重要作用
DOI：
10.1016/j.jplph.2011.10.009
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发表时间：
2012-03-01
影响因子：
4.3
通讯作者：
Tian, Xiaoli
中科院分区：
文献类型：
--
作者：
Li, Bo;Wang, Ye;Tian, Xiaoli
研究了地上部和根系在缺钾诱导的棉花叶片早衰中的调控作用。两个对照品种（CCRI 41，更敏感的缺钾;和SCRC 22，一个不太敏感的品种）选择自交和互接，采用标准嫁接（一个接穗/一个砧木），Y型嫁接（两个接穗/一个砧木）和倒V型嫁接（一个接穗/两个砧木）在苗期。2007年和2008年在实地研究了标准嫁接。在供钾充足的条件下，中棉所41和SCRC 22接穗的衰老差异不明显。无论砧木品种、嫁接类型、生育期和生长条件如何，在缺钾条件下，SCRC 22接穗的K含量、SPAD值（叶绿素含量）、可溶性蛋白含量和净光合速率均显著高于CCRI 41接穗。此外，SCRC 22接穗有更大的产量和更少的变化，无论是在上部和下部合轴节之间，或近端和远端的果实位置之间的主茎在田间缺钾，可能是由于减少叶片衰老的铃重。虽然在某些情况下，砧木对缺钾下叶片衰老的影响是显着的，接穗品种解释嫁接处理内的变化的百分比最高。地上部对钾素营养的高需求不是影响棉花植株早衰的主要因素，而是地上部对根的反馈信号，这可能是通过改变根系对钾素的吸收来实现的。(C)2011年Elsevier GmbH。All rights reserved.
The objective of this study was to determine the roles of shoot and root in the regulation of premature leaf senescence induced by potassium (K) deficiency in cotton (Gossypium hirsutum L.). Two contrasting cultivars (CCRI41, more sensitive to K deficiency; and SCRC22, a less sensitive cultivar) were selected for self- and reciprocal-grafting, using standard grafting (one scion/one rootstock), Y grafting (two scions/one rootstock) and inverted V grafting (one scion/two rootstocks) at the seedling stage. Standard grafting was studied in the field in 2007 and 2008. There were no obvious differences in senescence between CCRI41 and SCRC22 scions while supplied with sufficient K. However, SCRC22 scions showed significantly greater K content, SPAD values (chlorophyll content), soluble protein content and net photosynthetic rates than CCRI41 scions while grown in K deficient solution or soil, regardless of rootstock cultivars, grafting types, growth stage and growth conditions. Also, SCRC22 scions had greater yield and less variation in boll weight either between upper- and lower sympodials, or between proximal and distal fruit positions from the main stem in the field under K deficiency, probably owing to reduced leaf senescence. Although the effect of rootstocks on leaf senescence under K deficiency was significant in some cases, the scion cultivars explained the highest percentage of variations within grafting treatments. The shoot-to-root feedback signal(s), rather than high shoot demand for K nutrition, was involved in the shoot regulation of premature senescence in cotton plants, achieved possibly by altering root K uptake. (C) 2011 Elsevier GmbH. All rights reserved.