Critical air temperature and sensitivity of the incidence of chalky rice kernels for the rice cultivar "Sai-no-kagayaki"
Critical air temperature and sensitivity of the incidence of chalky rice kernels for the rice cultivar "Sai-no-kagayaki"
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DOI：
10.1016/j.agrformet.2014.11.016
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发表时间：
2015-04-15
影响因子：
6.2
通讯作者：
Shimada, Tomohide
中科院分区：
文献类型：
--
作者：
Masutomi, Yuji;Arakawa, Makoto;Shimada, Tomohide
稻米垩白粒的发生率高，主要是由于灌浆期气温高造成的，已成为日本稻米生产的一个重要问题。更糟糕的是，全球变暖将增加CRKs的发病率。本研究的目的是量化两个参数，代表CRKs的发病率的基本特征：T-cr，临界空气温度时，CRKs开始发生;和S-t，发病率的敏感性，空气温度变化以上T-cr。我们量化这两个参数为三组CRKs，其中所有五种类型的CRKs可以分为：白背白腹（BAB）;白基（BSD）;和乳白色和白芯（MAC）。为了量化参数，我们首先提出了一个简单的统计模型，其中包括Tcr和St。然后，使用现场实验数据，我们统计量化他们根据三组CRKs。本研究中使用的水稻品种是“西之香烧”。“结果显示，BAB、BSD和MAC的T（cr）分别为27.28 ℃、25.13 ℃和25.05 ℃。S（t）s的相应值分别为10.51%/℃、10.28%/℃和2.61%/℃。从这些结果来看，BSD和MAC发生在比BAB低约2摄氏度的空气温度下，并且BAB和BSD对空气温度变化的敏感性约为MAC的四倍。因此，BSD具有较低的临界空气温度和对空气温度变化的较高灵敏度。这些特征可以解释过去和现在观察到的BSD的高发病率。使用所提出的模型与量化参数的CRKs的发病率的估计表明，在BSD的发病率可能会继续高于其他类型，即使在全球变暖的未来变暖的早期阶段。(C)2014爱思唯尔有限公司版权所有。
A high incidence of chalky rice kernels (CRKs), caused mainly by a high air temperature during the grain-filling period, has become a significant problem for rice production in japan. Adding to the problem, global warming will increase the incidence of CRKs into the future. The objective of this study is to quantify two parameters that represent basic characteristics of the incidence of CRKs: T-cr, the critical air temperature at which CRKs begin to occur; and S-t, the sensitivity of the incidence to air temperature changes above T-cr. We quantify these two parameters for three groups of CRKs, into which all five types of CRKs can be divided: white-back and white-belly (BAB); white-based (BSD); and milky-white and white-core (MAC). To quantify the parameters, we first propose a simple statistical model that includes Tcr and St. Then, using field experimental data, we statistically quantify them according to the three groups of CRKs. The rice cultivar used in this study is "Sai-no-kagayaki." The results showed that T(cr)s for BAB, BSD, and MAC were 27.28 C, 25.13 degrees C, and 25.05 degrees C, respectively. The corresponding values of S(t)s were 10.51%/degrees C, 10.28%/degrees C, and 2.61%/degrees C. From these results, BSD and MAC occur at an air temperature about 2 degrees C lower than BAB does, and BAB and BSD have sensitivity to air temperature changes about four-fold that of MAC. Thus, BSD has both a lower critical air temperature and a higher sensitivity to air temperature changes. These characteristics can explain the observed high incidence of BSD in the past and at present. Estimations of the incidences of CRKs using the proposed model with the quantified parameters show that the incidence in BSD is likely to continue to be higher than in the other types even in the early stages of a warmer future under global warming. (C) 2014 Elsevier B.V. All rights reserved.