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采用~(14)CO_2标记方法研究了晚播小麦各叶位叶片同化物质的运转分配变化。研究表明,晚播小麦不同叶位叶片的~(14)C同化物向植株各部位的分配具有明显的分工,据此将晚播小麦主茎叶片分组。基部叶组即晚播小麦冬前及冬季出生的叶片(1—4叶),其同化物主要供给新生叶、根系,部分供给分蘖;中部叶组指返青至拔节期出生的叶片(5—8叶),其同化物主要供给叶片、茎秆和分蘖;拔节后出生的叶片为上部叶组(9—10叶)。上部叶组同化物的主要供给部位是穗、粒和茎秆。叶片分组在晚播小麦栽培实践上具有理论意义。
The ~ (14) CO_2 labeling method was used to study the distribution of assimilate turnover in leaves of late sowing wheat. The results showed that the distribution of ~ (14) C assimilates in leaves at different leaf positions of late sowing wheat had obvious division to various parts of the plant, and the main stem leaves of late sowing wheat were grouped. The basal leaves were late-sowed in winter and winter leaves (1-4 leaves), the assimilates were mainly supplied to the new leaves, roots and partly to the tillers. The middle leaves were the leaves from green to jointing (5-8 Leaves), its assimilates mainly supplied leaves, stalks and tillers; the leaves born after jointing were the upper leaves (9-10 leaves). The main supply of the upper leaves assimilates is the spike, grain and stalk. Leaf grouping has theoretical significance in late-sowing wheat cultivation practice.