Effect of Organic Osmolytes on Pea Seed Yield under Drought Stress Conditions Imposed at Different Growth Stages
Drought is one of the major abiotic stresses which adversely affect crop growth and production worldwide as water is vital for every aspect of plant growth and development. The present experiment was carried out during the two growing seasons of 2012/2013 and 2013/2014, at The Experimental Farm, Faculty of Agriculture, Ain Shams University, Shoubra El-Kheima, Egypt, in order to investigate the effecting of using foliar application of organic osmolytes on vegetative growth, seed yield and quality of pea (Pisum sativum L) under drought stress conditions imposed at different growth stages. The plants were exposed to drought stress at different growth stages; vegetative growth stage, flowering stage, all growth stages and control plants (no stress imposed) and foliar application of organic osmolytes; glycine betaine (GB) was used at 2 mM/L and proline was used at 2 mM/L. Results showed that untreated plants (no stress imposed) and the both foliar GB or proline had the highest significant value of vegetative growth. No significant differences observed in the first season in abortion, while in the second season GB had the highest value but didn’t differ significantly with proline, control and its combination had the lowest value. The foliar application of GB produced the highest pod yield per plant and feddan compared with the other treatments. While, foliar application of GB or proline produced the highest hundred-seed weight compared with control treatment. The interaction among studied factors indicated that combination of GB or proline foliar application without drought stress had a little highest value followed by drought in vegetative and flowering stages.