Spatial distribution of potassium uptake across the cotton plant affects fiber length
Spatial distribution of potassium uptake across the cotton plant affects fiber length
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DOI：
10.1016/j.fcr.2016.04.025
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发表时间：
2016-06-01
影响因子：
5.8
通讯作者：
Chen, Dehua
中科院分区：
文献类型：
--
作者：
Chen, Yuan;Li, Yabing;Chen, Dehua
为提高棉花全株纤维品质，研究了棉花钾素吸收的空间分布与纤维长度的关系。2007年，通过田间试验研究了17个品种的钾素吸收和纤维长度的遗传差异。田间条件下，不同品种的吸钾量和纤维长度均存在差异。品种可分为三类：中等吸钾高纤维长度；高吸钾中等纤维长度；低吸钾纤维长度。2008年，我们选择了代表这三个类别的单一品种，分别研究了棉花吸钾量和棉纤维长度的空间分布规律。2009年，通过叶面喷施氯化钾，进一步研究了3个供试品种在3个施钾水平下的吸钾量和纤维长度的差异。植株上部和远端较高的钾吸收与较长的纤维有关；然而，在较低和较近的位置没有观察到这种联系。吸钾量和纤维长度的变化也与品种和施钾量有关。不施钾肥时，3个品种的吸钾量和纤维长度从下部到上部、从近端到远端依次递减。随着施钾量的增加，各部位的吸钾量均增加，尤其是上部和远端部位。品种四杂3号的纤维长度越长，上部和远端的吸钾量越大。徐杂3号在施钾量从225 kg·hm~(-1)增加到450 kg·hm~(-1)时，纤维长度显著下降。当施钾量从225 kg hm(-1)增加到450 kg hm(-1)时，苏棉9号的纤维长度不再增加。这些结果表明，合理的钾肥管理可以改善上部和上部吸钾能力中等、吸钾能力强的棉花品种的全株纤维长度。(C)2016爱思唯尔B.V.保留所有权利。
To enhance whole plant fiber quality of cotton, the relationship between the spatial distribution of potassium (K) absorption and fiber length was investigated. In 2007, a field experiment was conducted to assess genotypic differences among 17 cultivars for potassium absorption and fiber length. Differences in both K uptake and fiber length existed among cultivars in field conditions. The cultivars could be categorized into three classes: moderate K uptake and high fiber length; high K uptake and moderate fiber length; and both low K uptake fiber length. In 2008, single cultivars representative of each of these three classes were selected to further investigate spatial distribution patterns of K absorption and cotton fiber length, respectively. In 2009, differences among the three selected cultivars in K uptake and fiber length were further studied under three K fertilizer regimes and by foliar spraying of KCl. Higher K uptake at upper and distal positions of the plant was associated with longer fiber; however, at lower and proximal positions no such association was observed. The change of K uptake and fiber length is related to cultivar and K fertilizer application as well. For all three cultivars, without K fertilizer application, K uptake and fiber length decreased from lower to upper sections and from proximal to distal positions. With increasing K application, K uptake increased for all positions, especially upper and distal positions. For cultivar Siza3, higher fiber lengths were consistent with greater K uptake at upper and distal sections. For cultivar Xuza3, fiber length declined markedly when K application rate increased from 225 to 450 kg hm(-1) even if K absorption was enhanced. For Sumian9, fiber lengths were no longer increased when K rate increased from 225 to 450 kg hm(-1). These results suggested that rational K fertilizer management could improve whole plant fiber length of cotton cultivars that have intermediate K absorption potential with high uptake ability at upper and distal positions. (C) 2016 Elsevier B.V. All rights reserved.