光周期遗传特性对青饲料生长和养分吸收的影响

以青饲玉米为主要例子,结合有关资料,阐述了光周期性与营养体生长节律的相关规律.光周期对植物生长发育有影响,光周期可能通过光受体这个“门”重调植物昼夜节律钟的时相,达到对数百种基因表达的调控.光周期可以影响玉米对养分的吸收及利用.玉米地上部和地下部的不同元素养分浓度受光温相互作用的强烈影响;有人认为光周期能够改变植物生长调节物的浓度,而这些植物调节物能够影响植物根系对营养的吸收,认为光可能通过改变光敏色素系统来改变细胞膜对离子的渗透性,也可以引起植物营养器官形态变化,并提出假设:光周期对植物生长的影响可能部分归因于改变根系对养分的吸收.如果假设成立,人们可以利用这一规律影响营养体农业,从而获得高产.

Effects of photopenod on growth and nutrient uptake in silage corn

After studying on the photoperiod phenomenon, we recognized that growth of plants could be affected by photoperiod. Photoreceptors, which are called the entrance of ray, can reset the time of plant's day and night bio-clock. According to the process of resetting, hundreds of genes' expression could be regulated. Photoperiod could affect the nutrient uptake and utilization in maize. Strong interactions were observed between photoperiod and root-zone temperature on the concentration of numerous mineral elements in maize tops and roots. Someone proposed that photoperiod could affect the concentration of some plant-growth regulators. These plant-growth regulators could change the nutrient uptake, the effects of the phytochrome system, the membrane permeability to ions and vegetative organ morphology. Moreover, the observed effects of photoperiod on plant growth are due to their effects on the nutrient uptake. If the phenomenon is true, It would contribute to high yield of vegetative organ agriculture.