Exogenous Hormones Alleviated Salinity and Temperature Stresses on Germination and Early Seedling Growth of Sweet Sorghum

Agronomy Journal - Tập 106 Số 6 - Trang 2305-2315 - 2014
Nimir Eltyb Ahmed Nimir1,2,3, Shiyuan Lu1,2, Guisheng Zhou1,2, B. L.4, Wenshan Guo1,2, Yong‐Hui Wang5
1Joint Lab. in Agricultural Science between Agriculture and Agri-Food Canada and Yangzhou Univ. Yangzhou Univ. Yangzhou 225009 Jiangsu Province China
2Key Lab. of Crop Genetics and Physiology of Jiangsu Province Yangzhou Univ. Yangzhou 225009 Jiangsu Province China
3Univ. of Khartoum Khartoum 11115 Sudan
4Eastern Cereal and Oilseed Research Center (ECORC), Agriculture and Agri-Food Canada, Central Experimental Farm, 960 Carling Ave., Ottawa, ON, Canada, K1A 0C6
5Institute of Agricultural Sciences of Jiangsu Costal Area Observation and Experimental Station of Saline Land of Costal Area, Ministry of Agriculture Yancheng 224001 China

Tóm tắt

Germination and vigorous growth are critical for seedling establishment, especially under salinity and high temperature. A laboratory experiment was done to determine the effects of salinity (0, 100, 200, and 300 mM NaCl) and temperature (25, 35, and 39°C) on germination and early seedling growth of two genotypes (Yajin 13 and Yajin 71) of sweet sorghum [Sorghum bicolor (L.) Moench]. Seeds were soaked in solutions with one of three hormones [288.7 μM gibberellic acid (GA3), 232.3μM kinetin, or their combination] and germinated under controlled conditions. Water imbibition, germination, radicle and shoot length, and the electrical conductivity of leachate were measured. Seed water imbibition increased with increasing temperature and decreased with increasing salinity level. Yajin 13 had 17.9% higher germination percentage with 16.3% higher germination velocity index than Yajin 71. Salinity and temperature stresses clearly affected germination and decreased subsequent shoot and root growth. The application of GA3, kinetin, or their combination alleviated the negative effects of salinity and temperature stresses on all the measurements. Among the tested hormones, GA3 was better in alleviating salinity and temperature stress in both genotypes in germination and other parameters except water uptake. It was concluded that seeds treated with suitable exogenous hormones may serve as a possible way to improve water imbibition and to alleviate the negative effects produced by salinity and high temperature on germination and early seedling growth of sweet sorghum.

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Agronomy Journal

Tập 106 Số 6

2305-2315

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