CAJ | 학술논문

研究了夜间低温对两个芒果(Mangifera indica)品种翡翠芒(Khieo Sawoei)和四季芒(Choke Anand)光合生理的影响.两个芒果品种的幼茼盆栽于全光和50%相对光强下一年.在第二年的冬季,连续7天晚上将芒果幼苗移到4℃的冷库中,白大保持原条件.于低温处理前、处理期间和结束低温处理后10天中测定芒果幼苗的光合生理特征.结果表明,夜间低温导致两个芒果品种的净光合速率、气孔导度和光系统Ⅱ的最大光化学效率(Fv/Fm)降低、非光化学猝灭(NPQ)上升.夜间低温对生长在全光下的芒果幼苗光合作用的抑制比50%光下的更重.翡翠芒的Fv/Fm比四季芒下降的更多,但后者的NPQ上升更多.夜间低温还导致两种光下芒果幼苗叶片的叶绿素含量下降,类胡萝卜素/叶绿素比值、丙二醛含量、膜的透性和可溶性化合物(可溶性总糖和脯氨酸)上升.解除低温胁迫后,四季芒Fv/Fm的恢复比翡翠芒的快.解除低温胁迫7天后二者的F发、Fv/Fm能完全恢复.上述结果表明,翡翠芒对低温更敏感,遮荫可以明显缓解两个芒果品种低温引起的光抑制.
연구료야간저온대량개망과(Mangifera indica)품충비취망(Khieo Sawoei)화사계망(Choke Anand)광합생리적영향.량개망과품충적유동분재우전광화50%상대광강하일년.재제이년적동계,련속7천만상장망과유묘이도4℃적랭고중,백대보지원조건.우저온처리전、처리기간화결속저온처리후10천중측정망과유묘적광합생리특정.결과표명,야간저온도치량개망과품충적정광합속솔、기공도도화광계통Ⅱ적최대광화학효솔(Fv/Fm)강저、비광화학졸멸(NPQ)상승.야간저온대생장재전광하적망과유묘광합작용적억제비50%광하적경중.비취망적Fv/Fm비사계망하강적경다,단후자적NPQ상승경다.야간저온환도치량충광하망과유묘협편적협록소함량하강,류호라복소/협록소비치、병이철함량、막적투성화가용성화합물(가용성총당화포안산)상승.해제저온협박후,사계망Fv/Fm적회복비비취망적쾌.해제저온협박7천후이자적F발、Fv/Fm능완전회복.상술결과표명,비취망대저온경민감,차음가이명현완해량개망과품충저온인기적광억제.
We investigated the effect of night chilling on the photosynthetic physiology of two eultivars of mango ( Mangifera indica) 'Choke Anand' and 'Khieo Sawoei'. The potted mango seedlings of both cultivars were grown under the full light and 50% daylight for one year. In the following winter season (February 2006), the seedlings were moved to a cold stor age room maintaining 4℃ for seven consecutive nights and returned to their original places during the rest of the day. Photosynthetic physiology was measured before, during the treatment, and during 10 days after the treatment. Chill-night treatment resulted in strong suppression in net photosynthesis ( Pn ), stomatal conductance ( g, ), and maximum photochemical efficiency of PSU ( Fv/Fm ), and increased non-photochemical quenching (NPQ) for both cultivars. Overall, the chilling induced photosynthetic suppression was stronger in seedlings grown in full sunlight than in 50% daylight. The decrease in Fv/Fm was stronger in 'Khieo Sawoei' than in 'Choke Anand' cultivar, and the increase of NPQ was relatively higher in 'Choke Anand' compared to 'Khieo Sawoei' cultivar. Night chilling resulted in a decrease in chlorophyll content and increase in the carotenoid: chlorophyll ratios, the malondialdehyde (MDA) contents, membrane leakage, as well as compatible solutes (total soluble sugar and proline) under both irradiances. After termination of the chilling treatment, the recovery of Fv/Fm was relatively quicker in 'Choke Anand' than in 'Khieo Sawoei' cultivar. Both cultivars showed a complete recovery after seven days of termination of the chilling treatment. These results showed that 'Khieo Sawoei' was more sen sitive to chilling than 'Choke Anand', and shading significantly alleviated the chilling-induced photoinhibition.