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叶片出生动态是小麦生长发育进程及其协调状况的重要表现 .研究发现 ,小麦叶片出生与播后累积GDD( growingdegreedaysaftersowing)的关系遵循两段 (阶段Ⅰ快于阶段Ⅱ )线性模式 ,护颖分化期为两段模式的分界点 ,这一规律在正常发育的冬性和春性品种的主茎及分蘖中表现一致 .冬性品种播期 1( 9月 3 0日 )、播期 3 ( 3月 2日 )的主茎及冬、春性品种各播期的T3分蘖 ,因生长发育异常而“阶段Ⅱ”提前 .冬性品种播期 2 ( 10月 3 0日 )一生中叶片出生热速率 (单位热时间所出生的叶数 )较高且相对稳定 ;春性品种叶片出生热速率随播期推迟而加快 .结果初步阐明了小麦叶片出生的蘖位差异及随品种、播期而变化的生物学规律
The dynamic of leaf emergence is an important manifestation of the process of wheat growth and development and its coordination status.It was found that the relationship between the birth and the cumulative GDD of wheat leaves was in accordance with two linear models (phase Ⅰ was faster than phase Ⅱ) Is the cut-off point of the two modes, and this rule is consistent in the main stem and tiller of the normal winter and spring varieties. The winter sowing date (September 30), sowing date 3 (March 2 days) of the main stem and spring and winter varieties of each sowing date T3 tiller, growth and development due to abnormal and “stage Ⅱ” ahead of winter sowing sowing 2 (October 30) in the life of the leaf heat rate of birth ( The number of leaves born per unit of heat time was relatively high and relatively stable.The heat rate of leaf emergence of spring varieties was accelerated with the delay of sowing dates.Results The differences of tillers and the changes of biomass with sowing date Learn the law