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狭行距、高密度栽培是一项有希望的棉花(陆地棉)生产制度,但是如果管理工作不适当,营养生长和棉铃发育间的动态平衡将被打乱,结果纤维产量低。进行本试验是研究棉花营养生长和棉铃发育的碳水化合物状况间的关系。在两个生长季节在群体密度每平方米为7.4、14.8和22.2株(译者注:合每亩4936株、9872株和41808株)的狭行栽培情况下,比较植株干重和可利用碳水化合物总量(TAC)。虽然棉株体积有很大的差异,然而不同采样期三种群体间的TAC水平是相似的。TAC为环状模式,生长季节中期为低水平。当纤维产量高时这种低水平是与结实器官干重的快速增长相一致,而当纤维产量低时则与营养体干重快速增长相一致。过度的营养生长有效地和结实器官竞争TAC。在一次有关试验中,邻近着生有正在发育棉铃的棉株主轴中段在棉株主轴上分布的TAC水平最低。这就表明在棉株内部TAC低水平处可被相对地区域化,由此使人想起光合产物由棉株顶部向棉株中部运送并不有效。重视株型育种,调态棉株冠层使能有较多的阳光照射到邻近有正在发育中棉铃的叶片和或者选育由上部叶片向发育中棉铃运送同化产物更有效的品种,可能有助于提高棉花产量。
Narrow-spacing, high-density cultivation is a promising cotton (Upland) system, but if management is not done properly, the dynamic balance between vegetative growth and boll development will be disrupted, resulting in low fiber yields. This experiment was conducted to study the relationship between the vegetative growth of cotton and the carbohydrate status of boll development. In two growing seasons, with a population density of 7.4, 14.8, and 22.2 per square meter in narrow-row cultivation, the dry weight of plants and the available carbon Total compound (TAC). Although there is a large difference in the size of cotton plants, the TAC levels among the three populations at different sampling periods are similar. TAC is a ring pattern with low levels in the middle of the growing season. This low level is consistent with the rapid increase of dry weight of solid organs when the fiber yield is high, while it coincides with the rapid increase of dry weight of vegetative body when the fiber yield is low. Excessive vegetative growth effectively competes with solid organs for TAC. In a related experiment, the distribution of TAC on the spindle of the cotton plant near the middle of the cotton spindle bearing the growing cotton boll was the lowest. This indicates that the TAC can be relatively localized at low levels of TAC inside the cotton plant, thus reminiscent of the fact that the photosynthetic product is not efficiently transported from the top of the cotton plant to the middle of the cotton plant. Emphasis on plant type breeding, the ability to modulate cotton canopies to allow more sunlight to reach nearby bolls of developing bolls, and / or the selection of more efficient varieties that deliver assimilates from growing upper leaves to growing bolls may be helpful To increase cotton production.