Determination the most suitable effective traits on grain yield of bread wheat genotypes under normal and drought conditions in Darab region, Fars Province

Subject Areas : Journal of Plant Ecophysiology

Vahid Barati ¹ ( Shiraz University )
Ehsan Bijanzadeh ² ( null )
Ruhollah Naderi ³ ( Assistant prof. )

Received: 2017-05-29 Accepted : 2018-04-30 Published : 2019-12-22

Keywords: Path analysis, stepwise regression, simple correlation, Multiple liner regression,

Abstract :

Drought stress is the most limiting factor for producing wheat grain yield, especially in southern Iran. In order to recognize the most influential appropriate agronomic traits on grain yield of promising wheat genotypes (16 line) under normal irrigation and drought stress conditions, this study was conducted at Darab, Fars province in 2012-2013 and 2013-2014. Drought stress was started after anthesis and continued to physiological maturity. Days to physiological maturity was counted during growing seasons. At the end of growing seasons, 1000-kernal weight, grain no. per spike, spikelet no. per spike, floret no. per spikelet, tiller no. per unit area, crop height, grain yield, above ground biological yield (BY) and harvest index (HI) were measured. Four statistical methods including simple correlation, multiple linear regression, stepwise regression and path analysis were used for determined the relationship between the above mentioned traits and grain yield under the two irrigation treatments. Results showed that BY and HI for normal irrigation and for drought condition days to physiological maturity, BY and HI were the most important influential traits on yield. Based on the most statistical analysis, the BY role on grain yield was lower at drought condition than normal irrigation. Also, improving grain yield was attributed to HI under drought condition.

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