小麦不同蘖位叶片出生的两段线性模式及其品种、播期效应

摘要/Abstract

摘要： 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(growing degree days after sowing)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30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30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.

关键词: 小麦, 叶片出生, 动态模式

Abstract: Dynamics of leaf emergence shows the development progress and its relationship with growth in wheat. It was found that two phase linear model equations (phase Ⅰ faster than phase Ⅱ) divided by glum differentiation stage could describe leaf emergence progress in relation to growing degree days (GDD) after sowing in wheat. This pattern was consistent in main stems and tillers of normal development with both winter and spring type varieties. The beginning of phase Ⅱ shifted to an earlier development stage on main stems of winter type varieties of early planting (EP, September 30) and late planting (LP, March 2), and on T3 of both varieties of EP, MP (middle planting, on October 30) and LP due to their abnormal development. The thermal rate of leaf emergence on main stem was relatively high and steady during development for winter type variety of MP, and quickened with the postponing of sowing for spring type variety. The above results illustrated the difference of leaf emergence at different tillering positions, and the biological characteristics affected by different varieties and sowing dates.

Key words: Wheat, Leaf emergence, Dynamic model

曹卫星, 李存东, 严美春, 邹薇. 小麦不同蘖位叶片出生的两段线性模式及其品种、播期效应[J]. 应用生态学报, 2000, (3): 369-372.

CAO Weixing, LI Cundong, YAN Meichun, ZOU Wei. Two-phase linear models of leaf emergence at different tillering positions in wheat and effects of different varieties and sowing dates[J]. Chinese Journal of Applied Ecology, 2000, (3): 369-372.

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