Estimation, variation and importance of leaf curvature in Zea mays hybrids
Estimation, variation and importance of leaf curvature in Zea mays hybrids
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DOI：
10.1016/j.agrformet.2008.05.015
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发表时间：
2008-09-03
影响因子：
6.2
通讯作者：
Van Volkenburgh, Elizabeth
中科院分区：
文献类型：
--
作者：
Ford, E. David;Cocke, Allison;Van Volkenburgh, Elizabeth
玉米叶片是弯曲的，但这种曲率不能用基于圆锥截面的单一方程组来描述。利用最大叶高和叶尖：最大叶高比，对杂交种间曲率、叶位和种植密度进行了比较。通过这些测量，1991年发布的现代混合动力车（先锋3394）与1963年发布的混合动力车（先锋3306）和1936年发布的混合动力车（先锋307）相比显示出较小的曲率。3394叶片的直立度明显高于其它品种。曲率是一个塑料字符。虽然所有杂交种在高密度种植中的曲率较小，但3394的效果最大。3394的叶较短，更披针形，叶面积较小，叶附着点周围的扭矩较低，叶耳基部明显较小，叶片和叶耳基部之间的角度较小。这些结果支持的建议，弯曲的模式可能产生的进展不可逆弯曲叶片发育过程中。结果表明，叶片曲率的差异与中脉形态和解剖结构的测量值之间没有一致的关系。我们表明，在这项研究中，这种方法是有偏见的，一个理查兹函数描述的累积频率分布的叶面积的倾斜角更有效。一个无偏估计的重要性进行了讨论，在不同倾角的表面收到的光子通量密度的变化。(C)2008 Elsevier B.V.保留所有权利。
Maize leaves are curved but this curvature cannot be described by a single system of equations based on conic sections. We made comparisons of curvature between hybrids, leaf positions and planting density using measures of maximum leaf height and leaf tip:maximum leaf height ratio. with these measures a modern hybrid released in 1991 (Pioneer 3394) shows less curvature compared with hybrids released in 1963 (Pioneer 3306) and 1936 (Pioneer 307). The greater uprightness of 3394's leaves was apparent for all leaves measured. Curvature is a plastic character. While all hybrids developed less curvature in higher density plantings the effect was greatest for 3394. 3394 had shorter, more lanceolate leaves with smaller leaf area, a lower estimated torque around the point of leaf attachment to the stem, and a significantly smaller auricle base and smaller angle between the leaf blade and auricle base. These results support suggestions that the pattern of curvature may be produced by the progression of irreversible bending during leaf development. We found no consistent relationships between differences in curvature and measurements of leaf midrib morphology or anatomy.A frequently used approach in modeling foliage area distribution by angle is to use an approximation provided by the angular distribution of an ellipsoid. We show that for leaves in this study this approach is biased and that a Richards function describes the cumulative frequency distribution of leaf area by inclination angle more effectively. The importance of an unbiased estimator is discussed in relation to the variation in photon flux density received by surfaces of different inclinations. (C) 2008 Elsevier B.V. All rights reserved.