Evaluation of drought stress effects on some seed germination and seedling growth characteristics in Tetraploid cultivars and domestic masses (Diploid) of cotton

Document Type : Research Paper

Authors

1 Horticulture Crops Research Department, Golestan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Gorgan, Iran

2 Cotton Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran

Abstract

In order to evaluation of drought stress on seed germination and seedling growth of cotton cultivars, a survey was carried out in two phases (under laboratory and green house conditions) in Cotton Research Institute. Researches were carried out in factorial experiment on CRD, with four replications. Factors were drought stress and cultivar. In germination test and greenhouse condition phases, water stress levels were included: 0, -0/4, -0/8 and -1/6 MPa (for germination test with D-Manitol application) and non-water stress, mild water stress and high water stress (75, 15 and 5 % of relative soil water content, respectively) were considered for greenhouse phase after 35 days after planting date. Cultivars were contained: Sahel, Tabladilla, Siokra and No-200 as Tetraploid cultivars and Hashem Abad and Kashmar as Diploeid cultivars. Results of seed germination test indicated that the lowest germination percent in 4th day, total germination percent and germination velocity was occurred under -1/6 MPa water potential. Germination rate was not different in 7th day and total germination percent between 0 and -0/4 MPa levels. Siokra has the highest total germination percent, germination velocity. Results of greenhouse experiment, drought stress decreased leaf fresh weight significantly. Plant height and total leaf chlorophyll was affected by first and second stress levels equally but the highest value of total chlorophyll was formed under high water stress level. In this part of study, total dry weight of seedlings has not shown any difference. Tabladilla has a good performance in compare to other cultivars under means of drought stress levels. Results suggested that germination percent in upper than -0/8 MPa water potential did not success in studied cultivars on farm and if it is forecasted a drought stress period in initial growth season after establishment, It is better to planting Tabladilla for cultivation.

Keywords


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