Effects of solar radiation on root and shoot growth of maize and the quantitative relationship between them
Effects of solar radiation on root and shoot growth of maize and the quantitative relationship between them
复制标题
太阳辐射对玉米根、冠生长的影响及其定量关系
DOI：
10.1002/csc2.20416
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发表时间：
2020-12-22
期刊：
影响因子：
2.3
通讯作者：
Li, Shaokun
中科院分区：
文献类型：
--
作者：
Guo, Xiaoxia;Yang, Yunshan;Li, Shaokun
太阳辐射是影响玉米生长的重要环境因子。根系和地上部生长以及谷物产量。本研究于2018年和2019年在中国奇台和银川进行。以玉米品种XY 335、ZD 958和DH 618为试验材料，种植密度分别为7.5 × 104（D1）和12 × 104（D2）株/公顷，遮光率分别为15%（S1）、30%（S2）和50%（S3），自然光为对照（CK）。结果表明，在2年的平均遮光和密度处理中，遮光使XY 335、ZD 958和DH 618的籽粒产量分别比对照平均减产40.4%、39.2%和35.6%。太阳辐射对根系干重的影响大于对地上部干重的影响，导致根冠比随遮光程度的增加而降低。定量分析结果表明，太阳辐射每减少1 MJ·m ~（-2），根干重、地上部干重和根冠比分别减少0.1938g·m ~（-2）、1.3517g·m ~（-2）和0.0103 × 10 ~（-2）。根据这一数量关系，可为不同地区不同日照条件下选择具有适宜根系特性的品种和种植密度提供依据。从地上部和产量方面来看，DH 618耐荫性较强，当太阳辐射减少时，其根系能迅速调整以补偿地上部生长和产量形成。在今后的生产和育种中应重视这类品种。
Solar radiation is an important environmental factor affecting maize (Zea mays L.) root and shoot growth and grain yield. This study was conducted in Qitai and Yinchuan, China, in 2018 and 2019. The maize cultivars of XY335, ZD958, and DH618 and planting densities of 7.5 x 10(4) (D1) and 12 x 10(4) plants ha(-1) (D2) were adopted under shading levels of 15 (S1), 30 (S2), and 50% (S3) with natural light as the control (CK). The results showed that averaging all shading and density treatments over the 2 yr, shading reduced the grain yields of XY335, ZD958, and DH618 by an average of 40.4, 39.2, and 35.6%, respectively, compared with the CK. The effect of solar radiation on the root dry weight was greater than that on the shoot dry weight, which resulted in a decrease in root/shoot ratio with increasing shading level. The quantitative analysis results showed that for every 1-MJ m(-2) decrease in solar radiation, the root dry weight, shoot dry weight, and root/shoot ratio decreased by 0.1938 g m(-2), 1.3517 g m(-2), and 0.0103 x 10(-2), respectively. According to this quantitative relationship, it was helpful to select cultivars and planting density with suitable root characteristics under different solar radiation conditions in different regions. From the aspects of shoot and grain yield, DH618 was more shade resistant, and its root system rapidly adjusted to compensate for shoot growth and yield formation when solar radiation decreased. Such cultivars should be given attention in future production and breeding.