Abstract
This experiment was conducted to evaluate the effects of osmopriming with KNO3on germination traits, seedling growth and phosphatase activities of lettuce (Lactuca sativa L.) seeds under salinity condition. Lettuce seeds (Var. Vista) were primed with KNO3 (0.05%) for 2 h at 25°C in the dark. Primed and non-primed seeds were germinated on distilled water containing 0 or 100 mM NaCl, for four days. Results show that germination percentage, root and shoot length and seedling fresh weight of primed seeds was higher than that of non-primed seeds in saline condition. Priming also increased acid phosphatase and phytase activities in the roots, shoots and cotyledons under salt stress. It seems that seed priming can be used for improving performance of lettuce seeds and seedlings grown under saline conditions. Key words: Osmopriming, lettuce, germination, salinity, acid phosphatase, phytase.
Highlights
Salinity is one major problem of increasing production in crop growing areas throughout the world
This experiment was conducted to evaluate the effects of osmopriming with KNO3 on germination traits, seedling growth and phosphatase activities of lettuce (Lactuca sativa L.) seeds under salinity condition
Osmopriming has been shown to activate the processes related to germination, through affecting the oxidative metabolism such as increasing superoxide dismutase (SOD) and peroxidase (POD) (Jie et al, 2002) or by the activation of ATPase as well as acid phosphatase and RNA synthesis (Fu et al, 1988)
Summary
Salinity is one major problem of increasing production in crop growing areas throughout the world. Seed priming is an efficient method for increasing seed vigor and improvement of germination and seedling growth (Mauromicale and Cavallaro, 1997). Seed priming is a process in which seeds are imbibed in water or osmotic solutions followed by drying before radical emergence (McDonald, 2000). This process has been used to improve germination, reduce seedling germination time, improve stand establishment, increase emergence, and to induce earlier flowering and maturing, which result in higher grain yield (Basra et al, 2005a). Osmopriming has been shown to activate the processes related to germination, through affecting the oxidative metabolism such as increasing superoxide dismutase (SOD) and peroxidase (POD) (Jie et al, 2002) or by the activation of ATPase as well as acid phosphatase and RNA synthesis (Fu et al, 1988)
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