Variability of mass of rice seedlings under the influence of stress
In recent years, the price of irrigation water has increased by more than 4 times, which leads to a decrease in the profitability of rice cultivation, in addition, water reserves in Krasnodar region are sufficient to irrigate 100 thousand hectares of rice crops, and rice irrigation systems occupy 300 thousand, which leads to its shortage during rice growing season. The change in the mass of seedlings in 47 rice samples of domestic breeding was assessed under dehydration stress in a laboratory experiment. The range of variability on the basis of the mass of the seedling was from 29.66 to 62.32 %; on average, varieties changed the mass of the seedling under stress by 37, 46 %. The maximum change of trait was observed in varieties: Aladdin, Atlas, Kurazh, Gamma, Partner (53.51 %), therefore, they are least adapted to stress. The mass of the seedling under the influence of stress was least changed in samples: Sonnet, Flagman, Den / Noch, Azovsky. The change in the trait was respectively: 20.88, 25.99, 27.86, 29.15%. These samples may be used as genetic sources by the trait of high dehydration resistance on seedling stage.