干旱和复水对4种咖啡叶片叶绿素荧光特性和SPAD的影响

Effect of Drought Stress and Rehydration on Chlorophyll Fluorescence Parameters and SPAD of Leaves of Four Catimor Cultivars of Coffea arabica

以小粒种咖啡卡蒂姆系列的4个咖啡品种为试验材料,研究干旱胁迫和复水对各咖啡品种叶绿素荧光值和SPAD值的影响。结果表明:干旱15 d时,除卡蒂姆1,其它品种的SPAD值均增加,干旱18 d时,SPAD值均低于原始值,复水6 d后各品种的SPAD值均有所增长;干旱胁迫时,各品种的叶绿素荧光参数最大光化学效率(Fv/Fm)、实际光化学效率(ΦPSII)、光合电子传递速率(ETR)均有所下降,随着干旱时间延长,叶绿素荧光参数下降程度都增加,复水后各咖啡品种荧光参数均上升,但恢复情况也有所不同;卡蒂姆4在整个试验过程中保持较高的Fv/Fm、ΦPSII、ETR。综上所述,根据干旱胁迫和复水后叶绿素荧光和SPAD值的表现,卡蒂姆4的抗旱性较好,卡蒂姆1和2要注意干旱季节的水分管理。

Four Catimor cultivars of Coffea arabica were selected as the experimental materials to determine their leaf chlorophyll fluorescence parameters and SPAD under drought stress and rehydration by using FMS-2 and TYS-B. The result showed the leaf SPAD of Catimor 2, 3 and 4 increased after 15 days of drought stress except Catimor 1. The leaf SPAD values of all the cultivars were below initial values 18 days after drought stress, and increased six days after rehydration. The chlorophyll fluorescence parameters Fv/Fm, ΦPSII and ETR of all the cultivars under drought stress declined, and their decline were more serious with the drought stress. All the chlorophyll fluorescence parameters increased to some extents after rehydration, but different among cultivars. Throughout the experiment, Catimor 4 was higher in Fv/Fm,ΦPSII and ETR values. On the basis of chlorophyll fluorescence parameters and SPAD under drought stress and rehydration, Catimor 4 was higher in drought resistance. Water management should be paid attention to in Catimor 1 and 2 during dry season.