Study of the initial growth energy of the rice samples in the laboratory conditions

Abstract

The current paper has presented the results of estimating rice samples for the ability of energetic plant growth from under a layer of water. The resistance of varieties to flooding is of great relevance in Russia in the fight against weeds due to the deep layer of water that weeds cannot overcome. The purpose of the study was to estimate rice breeding samples for resistance to flooding and to select the best of them for use in crossings when breeding rice varieties resistant to flooding. For the study there have been taken the samples developed in the laboratory of rice breeding and seed production of the ARC “Donskoy” from the hybridization of domestic varieties ‘Kuboyar’ and ‘Kontakt’ with such Asian varieties as ‘Mazhan Red’, ‘Kharsu 80A’, ‘Khao Hlan On’ as the donors of the flood resistance gene. The study was carried out using glass cylinders of 42 cm high. As a result of the estimation of 48 rice varieties, there were identified the forms that have the highest initial growth rates and the ability to overcome a large layer of water under anaerobic conditions. The results of germination in cylinders showed significant differences between plants in terms of growth rate under water: after 3 days from seed sowing, the length of the sprouts varied from 0.1 to 1.7 cm, on the 8 th day it ranged from 2.0 to 12.0 cm, on the 13th it was from 8.4 to 47.0 cm. Three forth of the samples after 2 weeks had a small plant height up to 30 cm, the rest part of the samples exceeded this value. The greatest sprouts’ length was in the samples ‘1006’ (47.0 cm), ‘998’ (45.3 cm) and ‘997’ (40.3 cm), which can be grown in the field without herbicides using the technology of obtaining shoots from under a layer of water or used as donors of high growth energy. There has been identified the material of practical importance for the breeding process.

Keywords

• rice
• flooding
• growth energy
• abiotic stress
• immersion resistance