...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>日本作物學會紀事 >Relationships between Environmental Conditions and Production-and Consumption Activities of Individual Leaves in the Population of Rice Plant in a Paddy Field : IV. Leaf positional and seasonal cahnges in the rates of net photosynthesis and dark respiration in paddy fields of different plant spacing and fertilization
【24h】

Relationships between Environmental Conditions and Production-and Consumption Activities of Individual Leaves in the Population of Rice Plant in a Paddy Field : IV. Leaf positional and seasonal cahnges in the rates of net photosynthesis and dark respiration in paddy fields of different plant spacing and fertilization

机译：稻田中稻植物人口环境条件与生产和消费活动的关系：IV。叶子位置和季节性Cahnges，在不同植物间距和施肥的稻田净光合作用和暗呼吸率

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

To understand the contribution of each positional leaf to the dry matter production in rice populations or individual plants, net photosynthetic and dark respiration rates of individual leaves of different position and age were measured at four growth stages (reduction division stage, boot stage, heading stage and ripening stage) under full light and mutual shading conditions in the paddy field where different fertilization (high fertilizer, 1 kg/a of each of the three main elements; low fertilizer, 0.2 kg/a of the same elements) and plant spacing (wide spacing, 30 × 22.5 cm; close spacing, 30 × 7.5 cm) were given. 1. The maximum rate of photosynthesis of the uppermost leaf was considered to show the full capacity of production, and the ratio of the photosynthetic rate of each individual leaf to that of the uppermost leaf under the full light condition was regarded to indicate its relative vitality, while the decrease in the photosynthetic rate under mutual shading compared with that under full light was thought to be caused by the external factors. 2. At reduction division stage, the relative vitality of middle and lower leaves to the upper leaf were 80% ca. and 60% ca., respectively; and the external factors lowered the photosynthetic rates under mutual shading by 20% ca. and 35% ca. in the middle and lower leaf, respectively, compared with those under full light. Photosynthetic rate decreased as the time progressed, and the heavily fertilized plants had more efficient leaves in photosynthesis than those lightly fertilized during all the experimental period, but there was no significant difference between those of different plant spacing. In general, photosynthetic rates of individual leaves both under full light and mutual shading conditions decreased about 20% by each descend ofleaf position from the top. 3. Dark respiration rates decreased proportionally to photosynthetic rates during the aging processes of the leaves. The dark respiration rate of the lowest leaf did not exceed 30% of its net photosynthetic rate under mutual shading. Therefore, even the lowest leaf did not seem to be so-called parasitic.
机译：要了解各个位置叶对水稻种群的干物质产生的贡献，或单独的植物，不同位置和年龄的单个叶片的净光合和暗呼吸率在四个生长阶段测量（减少分裂阶段，启动阶段，标题阶段和成熟的阶段）在稻田中的全光和相互遮阳条件下，不同施肥（高肥，三个主要元素中的每一个中的1kg / a;低肥，0.2kg / a相同的元素）和植物间距（给出宽间距，30×22.5厘米;闭合间距，30×7.5cm）。 1.最上面的叶片的最大光合速率被认为显示出全部生产的全部产能，并且每个单独的叶片的比例在全灯条件下最上面的叶片的比率被认为是其相对活力虽然相互遮阳下的光合速率下降与全灯下的光合速率下降被认为是由外部因素引起的。在还原分裂阶段，中下叶对上叶的相对活力为80％CA.和60％的CA.外部因素降低了20％的相互遮阳下的光合速率。和35％的CA.在中间叶中，分别与全光下的叶子相比。当进展情况下，光合速率下降，而且受精植物在光合作用中的叶子比在所有实验期内轻微受精的植物更有效，但不同植物间距之间没有显着差异。通常，通过从顶部的每个下降位置的每个下降位置，在全光和相互遮阳条件下的个体叶片的光合速率下降约20％。 3.在叶片的老化过程中，暗呼吸速率与光合速率成比例地降低。在相互遮阳下，最低叶片的暗呼吸率不超过其净光合速率的30％。因此，即使是最低的叶片似乎也不是所谓的寄生。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号