论文部分内容阅读
以光合强度高,对光反应迟钝的729和株型优良,对光反应敏感的南粳35为主要亲本进行杂交。在F_4的分离群体中,经低(CO_2)空气筛选出高净光合材料,置于弱光下生长。根据不同光强下的形态、生理指标鉴定,可分辨出避阴和耐阴两种光合生态型。高产育种应选耐阴型。这种类型由强光转到弱光条件下,茎叶生长速度较慢,气孔反应迟钝,净光合强度下降较少,叶绿体光化学还原特性变化较稳定,对变化光强表现广泛的适应性。这些系列特性表明,耐阴型栽培在不同生态地区,在变动光强和高产群体叶片相互遮阴条件下,具有株高、叶型稳定和光合器有较高工作效率的特点。试验证明,这种生理特性是遗传的。
Photosynthetic rate of 729, which is sensitive to photoperiod, sensitive to photoperiod, was the main parent. In the segregating population of F_4, high net photosynthetic materials were screened out by low (CO_2) air and grown in low light. According to the different light intensity under the form of physiological indicators identified, can be identified shade and shade tolerance of two photosynthetic ecotypes. High-yielding breeding should be selected shade-type. This type of light from strong light to low light conditions, stem and leaf growth slower, stomatal unresponsive, decreased less net photosynthetic capacity, chloroplast photochemical reduction of more stable changes in the light intensity showed a wide range of adaptability. These series of characteristics show that shade-tolerant cultivation has the characteristics of plant height, leaf type stability and high efficiency of the photosynthesis apparatus in different ecological regions under the condition that the light intensity and the high yielding population shade each other shade. Experiments show that this physiological characteristic is genetic.