Morphological Characteristics of Maize Canopy Development as Affected by Increased Plant Density.
Morphological Characteristics of Maize Canopy Development as Affected by Increased Plant Density.
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DOI：
10.1371/journal.pone.0154084
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Li J
中科院分区：
文献类型：
--
作者：
Song Y;Rui Y;Bedane G;Li J
通过提高植物密度来提高作物生产力需要详细了解器官发育以应对日益激烈的种间竞争。因此，本文的目的是研究在增强的种间竞争下器官发育的特征。进行了田间试验，以调查 4 种玉米植株密度（即 2、6、12 和 20 株 m–2）（分别称为 PD2、PD6、PD12 和 PD20）的器官发育。为了应对增加的株间竞争，下部植物体中的叶片和鞘的长度增加，但上部植物体中的长度减少。与叶片延伸相比，鞘延伸似乎对增加的株间竞争不太敏感。一旦出现温和的株间竞争，叶片和节间的延伸就会对植物密度的增加做出反应，但对严重的竞争则不再做出任何反应。由于植物密度增加而导致生长速率降低，因此叶片宽度和节间直径均减小。总体而言，本研究认为器官扩张速率可以作为决定株间竞争程度的关键形态因素。
Improving crop productivity through higher plant density requires a detailed understanding of organ development in response to increased interplant competition. The objective of this paper is thus to investigate the characteristics of organ development under increased interplant competition. A field experiment was conducted to investigate organ development across 4 maize plant densities i.e. 2, 6, 12 and 20 plants m–2 (referred to PD2, PD6, PD12 and PD20 respectively). In response to increased interplant competition, lengths of both laminae and sheaths increased in lower phytomers, but decreased in upper phytomers. Sheath extension appeared to be less sensitive to increased interplant competition than lamina extension. Extension of laminae and internodes responded to increased plant density as soon as onset of mild interplant competition, but did not respond any further to severe competition. Both lamina width and internode diameter were reduced due to a smaller growth rate in response to increased plant density. Overall, this study identified that organ expansion rate can be taken as the key morphological factor to determine the degree of interplant competition.