Evaluating drought tolerance of castor ecotypes in the center of Iran

Pejman Nikneshan; Ali Tadayyon; Milad Javanmard

doi:10.1016/j.heliyon.2019.e01403

Evaluating drought tolerance of castor ecotypes in the center of Iran

Heliyon. 2019 Apr 8;5(4):e01403. doi: 10.1016/j.heliyon.2019.e01403. eCollection 2019 Apr.

Authors

Pejman Nikneshan¹, Ali Tadayyon¹, Milad Javanmard^{2

3}

Affiliations

¹ Agronomy Department, College of Agriculture, Shahrekord University, Shahrekord, Iran.
² Young Researcher and Elite Club, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.
³ Department of Horticulture (Medicinal and Aromatic Plants Section), Science and Research Branch, Islamic Azad University, Tehran, Iran.

Abstract

In order to study the reaction of six castor ecotypes to drought stress, a split plot experiment was carried out in randomized complete blocks. Eight indices including stress sensitivity index (SSI), tolerance index (TOL), mean productivity (MP), geometric mean productivity (GMP), harmonic mean (HARM), stress tolerance index (STI), sensitivity drought index (SDI) index and yield index (YI) were calculated for ecotypes by using seed yield in normal condition and under stress. After that, correlations between indices were calculated and dendrogram and biplot results were drawn. Normal yield and stress yield had positive significant correlations with MP, GMP, STI, and HARM indices in mild, moderate and severe stresses. Biplot analysis showed that Isfahan and Naein ecotypes had desirable yield under mild and average stress and Naein had desirable yield under severe stress and also normal condition.

Keywords: Agriculture.