论文部分内容阅读
研究了两系超高产杂交稻 (OryzasativaL .)“两优培九”和“华安 3号”以及多年来大面积推广的三系杂交稻“汕优 6 3”剑叶的PSⅡ活性和叶黄素循环对强光胁迫及其恢复进程的响应。结果表明 ,在 2 0 0 0 μmolphotons·m-2 ·s-1的强光胁迫下 ,3个杂交稻的PSⅡ光化学最大效率 (Fv/Fm)、开放的PSⅡ反应中心捕获激发能效率 (Fv′/Fm′)和PSⅡ的实际光化学转能效率 (ΦPSⅡ)都随着光抑制进程而下降 ,其中以“汕优 6 3”下降的幅度最大。光抑制过程中 ,杂交稻叶黄素循环的紫黄素 (V)组分迅速下降 ,与此同时 ,脱环氧化组分环氧玉米黄素 (A)和玉米黄素 (Z)迅速积累 ,而超高产杂交稻“两优培九”和“华安 3号”的A和Z的积累速度大大高于“汕优 6 3”。伴随A和Z的快速积累 ,它们的叶黄素循环的脱环氧化状态 (DES)迅速上升 ,并在半小时左右基本达到最大值 ,其中“两优培九”和“华安3号”DES的上升速率仍然较“汕优 6 3”高。光抑制处理结束后 ,转移到弱光 (70 μmolphotons·m-2 ·s-1)条件下恢复过程中 ,两个超高产杂交稻的Fv/Fm、Fv′/Fm′和ΦPSⅡ 的恢复速率和恢复水平都高于“汕优 6 3”。同时 ,它们的叶黄素循环组分V、A、Z以及DES都逐渐恢复 ,但“两优培九”和“华安 3号”的恢复速率和恢复水平仍然要优于
The effects of lutein cycling and PSⅡ activity on the flag leaf of three-line hybrid rice “Shanyou 6 3” of two-line super high yielding hybrid rice (Oryza sativa L.) and “Lianan 3” Response of Light Stress and Its Recovery Process. The results showed that under the light stress of 200 μmolphotons · m-2 · s-1, the PSⅡ photochemical maximum efficiency (Fv / Fm), the open PSⅡ reaction center capture excitation energy efficiency (Fv ’ / Fm ’) and the actual photochemical conversion efficiency (ΦPSⅡ) of PSⅡ all decreased with the progress of photoinhibition, and the decrease of “Shanyou 63” was the largest. During photoperiod suppression, the composition of violet (V) in the lutein cycle of hybrid rice decreased rapidly. At the same time, the rapid degradation of the epoxidized zeaxanthin (A) and zeaxanthin (Z) While the accumulative speed of A and Z in super high-yield hybrid rice “Liangyou Peijiu” and “Huaan No.3” was much higher than that of “Shanyou 6 3”. With the rapid accumulation of A and Z, the desoxygenation state (DES) of their lutein cycle increased rapidly and reached the maximum within about half an hour, in which the rate of descending of “Liangyoupeijiu” and “Huaan No.3” Still more than “Shanyou 6 3” high. The restoration rates of Fv / Fm, Fv ’/ Fm’ and ΦPSⅡ of two super-high-yielding hybrid rice transformed to low light (70 μmolphotons · m-2 · s-1) Recovery level is higher than “Shanyou 6 3”. At the same time, their xanthophyll cycle components V, A, Z and DES gradually recovered, but the recovery rates and recovery rates of “Liangyou Peijiu” and “Huaan No.3” were still better than those of “Liangyou Peijiu” and “Huaan No.3”