关键词:棉花; 叶片; 缺K症状; K+含量; 时空动态 Spatiotemporal Pattern of Potassium Deficiency Symptoms and K+ Concentration in Cotton Leaf CHEN Qiao1, TIAN Xiao-Li1,*, YAN Wei1, WANG Ning1,2 1 Center of Crop Chemical Control, China Agricultural University / State Key Laboratory of Plant Physiology and Biochemistry, Beijing 100193, China
2 Cotton Research Institute, Chinese Academy of Agricultural Sciences / State Key Laboratory of Cotton Biology, Anyang 455000, China
Fund:This study was supported by the National Natural Science Foundation of China (31271629) AbstractIn order to explore the physiological mechanism of an unusual phenomenon that potassium (K) deficiency symptom first occurs in medium and upper leaves rather than lower leaves of cotton plants, field experiments were conducted at Shangzhuang Experimental Station of China Agricultural University with a low K soil (64.0 to 70.9 mg kg-1 of available K) in Beijing (40º08′N, 116º10′E) during 2013 and 2014 growing season, using CCRI 41 ( Gossypium hirsutum L.; susceptible to K deficiency) as material. There were three potassium treatments: control (no potassium applied), low potassium (225 kg K2O hm-2) and high potassium (375 kg K2O hm-2). We observed potassium deficiency symptoms of the main stem leaves from squaring stage to late stage of flowering and boll period and determined the content of K+ of blade. It was found that K deficiency symptoms developed upward from the leaf located at the tenth node or so of mainstem, and those leaves below this node did not show symptoms during the whole season. However, this type of upward development of K deficiency symptoms was not successive; some leaves at medium part of mainstem (the 16th node or so) were always normal or near normal. There was no necessary link between the pattern of K deficiency symptoms and K+ concentration in cotton leaves. The latter generally increased with the leaf position raised from bottom to top, which is in accord with the common pattern under K deficiency. However, the increased magnitude from bottom to top and the leaf position with a larger increase in K+ concentration were different at contrasting growth stages, as well as between 2013 and 2014. The K+ concentration in most leaves decreased faster or slower over time. Nevertheless, some young or functional leaves (e.g. from the 7th to 14th node in 2013, and from the 13th to 16th node in 2014) showed an increase of K+ concentration during the period from squaring stage to peak blooming stage. In conclusion, the spatiotemporal pattern of K deficiency symptoms in cotton leaves is more complicated than expected; and according to K+ concentration in leaves we cannot explain it well. The further study should focus on the susceptibility to K deficiency in leaves at different positions, and K+ redistribution in whole plant.
Keyword:Cotton; Leaf; K deficiency symptom; K+ concentration; Spatiotemporal pattern Show Figures Show Figures
图1 2014年不同生育时期棉花主茎叶缺K症状(不施K对照) 数字代表叶位。Fig. 1 Potassium deficiency symptoms of cotton mainstem leaves at different growth stages in 2014 (no potassium applied) The number represents leaf positions.
4 结论在严重缺钾的土壤上, 棉花叶片在蕾期开始表现出缺钾症状, 且首先出现在中部叶片; 随生育进程棉花叶片缺钾症状在叶位间呈现出跳跃性分布, 且与叶片钾含量的变化不完全一致。蕾期到花铃后期, 棉花不同叶位主茎叶片的钾含量呈自上而下逐渐降低的梯度变化。部分幼叶和功能叶的钾含量在蕾期到盛花期会出现阶段上升的现象。在进行棉花钾营养诊断时应将形态学诊断和组织学诊断相结合。 The authors have declared that no competing interests exist.
作者已声明无竞争性利益关系。The authors have declared that no competing interests exist.
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