摘要
在北京西北郊前北京农业大学试验站大田中旱种2种抗旱力不同的稻种"秦爱"和"石狩"!并在校内网室控水条件下作了盆栽试验。测定了2品种在不同时期不同土水势下的叶水势,根系伤流液和光合强度。结果表明"秦爱"在受水胁迫的情况下,叶水势明显地比"石狩"高。反映在生理功能上,表现出水胁迫条件下前者的根系伤流液明显地多于后者,光合强度也高于后者。说明叶水势可作为筛选抗旱品种的一个指标。"秦爱"的根系活力比"石狩"强,可能是它在逆境下维持较高叶片水饱和度的一个原因。@刘鲁民$在北京西北郊前北京农业大学试验站大田中旱种2种抗旱力不同的稻种"秦爱"和"石狩"!并在校内网室控水条件下作了盆栽试验。测定了2品种在不同时期不同土水势下的叶水势,根系伤流液和光合强度。结果表明"秦爱"在受水胁迫的情况下,叶水势明显地比"石狩"高。反映在生理功能上,表现出水胁迫条件下前者的根系伤流液明显地多于后者,光合强度也高于后者。说明叶水势可作为筛选抗旱品种的一个指标。"秦爱"的根系活力比"石狩"强,可能是它在逆境下维持较高叶片水饱和度的一个原因。@华孟$在北京西北郊前北京农业大学试验站大田中旱种2种抗旱力不同的稻种"秦爱"和"石狩"!并在校内网室控水条件下作了盆栽试验。测定了2品种在不同时期不同土水势下的叶水势,根系伤流液和光合强度。结果表明"秦爱"在受水胁迫的情况下,叶水势明显地比"石狩"高。反映在生理功能上,表现出水胁迫条件下前者的根系伤流液明显地多于后者,光合强度也高于后者。说明叶水势可作为筛选抗旱品种的一个指标。"秦爱"的根系活力比"石狩"强,可能是它在逆境下维持较高叶片水饱和度的一个原因。
Two genetypes of rice,'Qin-ai'and'Shi-shou',with different drought tolerance('Qin-ai'strong,'Shi-shou'weak)were grown in the fields and pots with controlled water conditions in Northwest Beijing.Leaf water potentials,root bleeds and photosynthesis intensities of two genetypes of rice were measured under various soil water potentials and air humidities in diffrent periods.The results indicated that'Qin-ai'has higher leaf water potential,stronger photosynthesis intensity,and more root bleed than'Shi- shou'under water stress.It can be concluded from the experiment that leaf water potential can be considered as a criterion for selecting drought tolerance genotype of rice and the stronger root activity of'Qin-ai'may be the reason of its higher leaf water potential.
关键词
陆稻
抗旱性
叶水势
rice
drought tolerance
leaf water potential
