Grain filling mechanisms in spring wheat. I. Grain filling phases according to the development of plant organs
Grain filling mechanisms in spring wheat. I. Grain filling phases according to the development of plant organs
复制标题
春小麦籽粒灌浆机制。
DOI：
10.1626/jcs.62.560
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发表时间：
1993
影响因子：
--
通讯作者：
K. Nakaseko
中科院分区：
文献类型：
--
作者：
Tadashi Takahashi;N. Tsuchihashi;K. Nakaseko
为研究春小麦冠层籽粒灌浆的生理和形态机制，对春小麦冠层籽粒灌浆的生长期进行了测定，测定了灌浆期籽粒干重、茎秆结构重和可溶性糖含量。籽粒灌浆期分为四个阶段：(1)籽粒灌浆初期(从开花到停止伸长)，同化物主要用于秆伸长，籽粒干重略有增加；(2)籽粒灌浆早期(从秆伸长停止到乳熟期)，同化物既用于籽粒生长，也用于秆储备。(3)籽粒灌浆后期(从乳熟期到光合作用终止)，同化物完全用于籽粒生长，秸秆储备也被转移到籽粒中；以及(4)最终籽粒灌浆(从光合作用结束到成熟)，由于同化物不再被活跃地生产，籽粒的生长只靠秸秆储备的转移来维持。在灌浆前期和灌浆后期，茎秆中WSC的增长速率与辐射呈线性相关(r=0.616*)，而粒重则随时间线性增加(r=0.992*)，与辐射无关。
To define the growth phases for analyzing the physiological and morphological mechanisms of grain filling in a spring wheat canopy, the dry weight of the grains and the water soluble sugar content (WSC) and structural weight of the culm were measured for the variety Haruyutaka everyday during the grain-filling period. The grain-filling period was divided into four phases ; (1) Initial grain filling (from anthesis to cessation of culm elongation) where assimilate is used mainly for culm elongation and the dry weight of the grains increase slightly ; (2) Early grain filling (from cessation of culm elongation to the milk ripe stage) where assimilate is used for both grain growth and culm reserve. (3) Late grain filling (from the milk ripe stage to termination of photosynthesis) where assimilate is used entirely for grain growth and the culm reserve is also translocated to the grain ; and, (4) Final grain filling (from the end of photosynthesis to maturity) where grain growth is supported only by translocation of the culm reserve because assimiltate is no longer being actively produced. In the early and late grain-filling phases, the increase rate of the WSC in the culm was related linearly to radiation (r=0.616***), while grain weight increased linearly with time (r=0.992***), independent of radiation.