期刊
EUROPEAN JOURNAL OF AGRONOMY
卷 113, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.eja.2019.125989
关键词
Multiple low-temperature stress; Cold tolerance; Grain yield; Yield components; Winter wheat
类别
资金
- National Science Fund for Distinguished Young Scholars [31725020]
- National Natural Science Foundation of China [31872848]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
Low temperature greatly affects wheat production, while low-temperature pretreatments may enhance plant tolerance to subsequent low-temperature stress. However, the knowledge on grain yield formation responses to multiple low-temperature stresses under natural conditions is still limited. Here, two years of environment-controlled phytotron experiments were carried out with two wheat cultivars under different low-temperature levels, periods and frequencies, and the temperature regimes in this study were designed to be similar to the daily variation in natural temperature. Spring frost (canopy temperature fall below 0 degrees C or Stevenson screen air temperatures below 2 degrees C) had negative effects on grain yield and yield components for both cultivars. Moreover, wheat yield was more sensitive to low temperatures at booting than at jointing. The reduction in grain yield under low-temperature conditions was mainly attributed to the decreased spike number per plant (SNPP) and grain number per spike (GNPS). Furthermore, grains in the apical spikelets were the most sensitive to spring frost, followed by those in the basal and central spikelets. Compared to the non-low-temperature-pretreated plants, the low-temperature-pretreated plants did not have an increased grain yield, except at T4 (T-min/T-max/T-mean - 6 degrees C/4 degrees C/ -1 degrees C). Grain yield under T4 probably increased because severe low temperatures killed parts of the tillers, which resulted in carbon and nitrogen relocation to the roots, young tillers and axillary buds. As a result, the young and new tillers in the axillary buds grew rapidly and eventually formed spikes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据