Kernel number prediction in maize under nitrogen or water stress
Kernel number prediction in maize under nitrogen or water stress
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DOI：
10.2135/cropsci2002.1173
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发表时间：
2002-07-01
期刊：
影响因子：
2.3
通讯作者：
Casanovas, M
中科院分区：
文献类型：
--
作者：
Andrade, FH;Echarte, L;Casanovas, M
玉米（Zea mayvs L.）与吐丝关键期作物的生理状况密切相关。本研究的目的是确定是否有一个共同的潜在的关系，每株籽粒数（KNP）和植物生长速率（PGR）的关键时期，植物生长变化，因为不同的非生物胁迫。KNP和PGR之间的关系，从以前的研究中获得的植物密度和入射辐射的变化作为参考。KNP和PGR测量的实验中，每株植物的入射辐射，氮（N），和水的可用性的实验来源的变化。拟合的方程得到的数据在不同的辐射水平解释了72%的变化，在不同水平的N或水的可用性得到的数据。此外，每组数据的不同模型并没有提供比两组数据合并的单个模型更好的拟合。当氮供应和水供应量变化时，KNP和PGR之间也存在共同的关系。KNP和PGR之间的关系，其中PGR是通过植物密度和遮荫变化的治疗也可以预测KNP的条件下，PGR是受水分和/或氮缺乏。籽粒结实关键期的PGR是玉米植株在广泛的环境和管理实践下结实籽粒的能力的良好预测因子。
Final kernel number in maize (Zea mayvs L.) is closely associated with the physiological condition of the crop during the critical period bracketing silking. The objective of this study was to determine whether there is a common underlying relationship between kernel number per plant (KNP) and plant growth rate (PGR) during that critical period when plant growth varies because of different abiotic stresses. A relationship between KNP and PGR obtained from a previous study of variation in plant density and incident radiation was used as reference. KNP and PGR were measured in experiments in which incident radiation per plant, nitrogen (N), and water availabilities were the experimental sources of variation. The equation fitted to the data obtained at different radiation levels explained 72% of the variation in the data obtained at different levels of N or water availability. Moreover, different models for each set of data did not provide a significantly better fit than a single model for the two sets of data combined. A common relationship between KNP and PGR was also obtained when N supply and water availability were variable. The relationship between KNP and PGR obtained for treatments in which PGR was varied through plant density and shading also could predict KNP for conditions in which PGR was affected by water and/or N deficiencies. The PGR during the critical period of kernel set is a good predictor of the capacity of the maize plant to set kernels under a wide range of environmental and management practices.