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作物学报 ›› 2015, Vol. 41 ›› Issue (12): 1888-1898.doi: 10.3724/SP.J.1006.2015.01888

• 耕作栽培·生理生化 • 上一篇    下一篇

田间条件下棉花叶片缺钾症状及钾含量的时空动态研究

陈乔1，田晓莉1,*，颜为1，王宁1,2   

  1. 1 中国农业大学作物化学控制研究中心 / 植物生理学与生物化学国家重点实验室，北京100193；2中国农业科学院棉花研究所 / 棉花生物学国家重点实验室，河南安阳 455000
  • 收稿日期:2015-05-04 修回日期:2015-07-20 出版日期:2015-12-12 网络出版日期:2015-08-05
  • 通讯作者: 田晓莉, E-mail: tianxl@cau.edu.cn, Tel: 010-62734550
  • 基金资助:

    本研究由国家自然科学基金项目(31271629)资助。

Spatiotemporal Pattern of Potassium Deficiency Symptoms and K+ Concentration in Cotton Leaf

CHEN Qiao1,TIAN Xiao-Li1,*,YAN Wei1,WANG Ning1,2   

  1. 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
  • Received:2015-05-04 Revised:2015-07-20 Published:2015-12-12 Published online:2015-08-05
  • Contact: 田晓莉, E-mail: tianxl@cau.edu.cn, Tel: 010-62734550
  • Supported by:

    This research was supported by the National Natural Science Foundation of China (31271629).

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摘要：

为了探究棉花中上部叶片首先出现缺钾症状的生理机制，以中棉所41为供试材料，于2013—2014年在中国农业大学上庄实验站缺钾(K)土壤上(速效K含量64.0~70.9 mg kg–1)进行试验，设置对照(不施钾)、低钾(225 kg K2O hm–2)、高钾(375 kg K2O hm–2) 3个钾处理，观察蕾期至花铃后期主茎叶缺K症状的发展动态，并测定了叶片的K+含量。结果表明，棉花叶片缺K症状并不是简单的自下部老叶逐步向上发展，而是从第10节位左右向上推移，并且这种推移呈跳跃式，植株中部某些叶位的叶片一直未出现缺K症状或症状很轻微。棉花这种缺K症状模式与叶片K+含量无必然联系。叶片K+含量基本遵循随叶位上升而增加的规律，符合缺K条件下的一般特征，但这种自下而上增加的幅度及增幅较大的部位在不同生育时期和不同年份存在差异。大部分叶片的K+含量随叶龄增长呈或快或慢的下降趋势，但在蕾期至盛花期某些幼叶和功能叶的K+含量会出现上升现象，如2013年的第7~第14叶、2014年的第13~第16叶。要揭示棉花缺K症状的生理机制，还需要从不同叶片对K+的敏感性、K+在整株水平的再分配等方面深入研究。

关键词: 棉花, 叶片, 缺K症状, K+含量, 时空动态

Abstract:

In 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.

Key words: Cotton, Leaf, K deficiency symptom, K+ concentration, Spatiotemporal pattern

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