Grain Filling Mechanisms in Spring Wheat : II. Growth, accumulation and translocation in the daytime and at night during the four grain filling phases

Japanese Journal of Crop Science

Naoyuki TSUCHIHASHI¹  Tadashi TAKAHASHI¹  Kimio NAKASEKO¹ 

关键词: Daytime and night time;    回帰分析;    Grain filling phase;    生長の量的評価;    Quantitative assessment of growth;    登熟相;    Regression analysis;    日中と夜間;    Spring wheat;    春播コムギ;   

DOI  :  10.1626/jcs.63.75

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The dry weights and water soluble sugar contents (WSC) in grain, ear, culm and leaves of the field grown spring wheat (cv. Haruyutaka) were measured every morning and evening throughout the grain filling period to determine the physiological and morphological mechanisms of grain filling. Many of these plant organs increased or decreased linearly during each grain filling phase, divided on the last report : (1) initial grain filling phase, (2) early grain filling phase, (3) late grain filling phase and (4) final grain filling phase. They were, therefore, analyzed by linear regression against the days after anthesis to determine the difference in dry matter accumulation among these four phases and the difference between daytime and night. The regression slope, increasing rate, in total biomass declined with growth and was almost zero during the final phase when canopy did not photosynthate. The slope in grain dry weight peaked during the late phase (60 mg pl-1 day-1). The WSC in the culm increased during the initial and early phase (22 and 11 mg pl-1 day-1, respectively), while it decreased during the late and final phases (-15 and -19 mg pl-1 day-1). In addition, the grain increased similarly between daytime and night during the initial, early and final phases, although its increasing rate in the daytime (45 mg pl-1 day-1) was threefold greater than at night (16 mg pl-1 day-1). During the early phase, the WSC in the culm increased during the daytime (18 mg pl-1 day-1), but decreased during the night (-8 mg pl-1 day-1). Therefore, this suggests that the WSC is accumulated in culm during the daytime and that it is translocated into the grains at night.

【 授权许可】

Unknown