The effect of water stress on dry weight and photosynthetic pigments in two sainfoin species

Document Type : Research Paper

Authors

1 Lorestan Agricultuer and Natural Resources Research Center.P.O.Box:348

2 Teacher Education Tehran University,Iran

3 Seed and Plant certification and Registration Research Institute

Abstract

Effect of water stress on dry weight and photosynthetic pigments in two sainfoin species (Onobrychis radiata & Onobrychis viciifolia) was surveyed in a factorial experiment based on a randomized complete block design with 4 replications . The plants under study were grown in a greenhouse environment with the maximum temperature of 38ºC and the minimum temperature of 14ºC. Forty days after cultivation, both species were put under water deficit stress based on the subtraction farm 75% field capacity ( FC ) and 50%FC, and samplings were carried out in germination and growth stages, with irrigation level of 100%FC being taken as control. In both types, water deficiency tension resulted in decreased relative growth rate (RGR),leaf area ratio (LAR) and relative leaf growth rate (RLGR).The measurement of imposed tension indices showed that Onobrychis viciifolia underwent the greatest tension in such a way that this species withheld at 50%FC tension level. The ratio of root to shoot (R/S) , length and weight of root increased,but in Onobrychis radiata the increase of these parameters were much higher than those of O. viciifolia . The biochemical surveys showed that carotens content and chlorophylls content decreased under the stress conditions in both species, but the xanthophyll content increases and the ratio of carotenoids to chlorophylls increased, with O. radiata beinghigher in this respect. Because the xanthophyll cycle is one of the strong mechanisms of anti-oxidation in plants, and prohibits of demolition of membranes and supports chlorophyll against photo–oxidation, the increase of xanthophyll results in the increase of plant’s resistance – threshold against oxidation stress arising to water deficit.

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References

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