PHYSIOLOGICAL RESPONSES OF CASTOR ECOTYPES (RICINUS COMMUNIS L.) TO DROUGHT STRESS

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NIKNESHAN PEJMAN; TADAYYON ALI

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Journal: JOURNAL OF PLANT PROCESS AND FUNCTION Year:2016 | Volume:5 | Issue:17 Page(s): 121-132

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Title

PHYSIOLOGICAL RESPONSES OF CASTOR ECOTYPES (RICINUS COMMUNIS L.) TO DROUGHT STRESS

Author(s)

NIKNESHAN PEJMAN | TADAYYON ALI | Issue Writer Certificate

Keywords

MOISTURE STRESSQ2

LIGHT EXTINCTION COEFFICIENTQ2

STOMATA CONDUCTANCEQ2

CHLOROPHYLQ1

Abstract

Castor is normally cultivated in marginal lands, in arid and semiarid climates and its oil is commonly used in industry and medicine. To investigate physiological responses in different castor ecotypes under different water deficit conditions, a field experiment was conducted in two locations of Isfahan and Shahrekord in year 2013. The experiment was carried out in split plot arrangement in randomized complete block design (RCBD) with three replications, and included four drought stress levels of 30, 45, 60 and 75 percent moisture depletion in soil as main plot and six castor ecotypes of Esfahan, Ardesrtan, Arak, Naeen, Yazd and Ahvaz as subplot in two locations separately. The results from both experiments were analyzed by combined analysis. The measured traits included total biomass, total CHLOROPHYLl, STOMATA CONDUCTANCE, PAR absorbed by crop canopy (PAR1), absorbed radiation to total radiation and LIGHT EXTINCTION COEFFICIENT. The results showed that the highest CHLOROPHYLl was 128.6 SPAD in Yazd ecotype in Isfahan region under control and the lowest one were 25.8 SPAD in Yazd ecotype in Shahrekord under severe stress. The highest STOMATA CONDUCTANCE and LIGHT EXTINCTION COEFFICIENT were 647.5 Mmol/m2s in Ardestan and Yazd (1.03) in Shahrekord under control and the lowest ones were 53.5 Mmol/m2s in Ahvaz and 0.07 in Naein in Shahrekord region under severe stress. Under severe drought condition, absorption of photo synthetically active radiation decreased by plant canopy, stomata closed and total CHLOROPHYLl also reduced, therefore, photosynthesis rate reduced and biomass production significantly reduced compared to non-stress condition. Castor in Isfahan region produced higher biomass. While ecotypes, despite the differences in physiological responses, showed no difference in biomass.

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APA: Copy

NIKNESHAN, PEJMAN, & TADAYYON, ALI. (2016). PHYSIOLOGICAL RESPONSES OF CASTOR ECOTYPES (RICINUS COMMUNIS L.) TO DROUGHT STRESS. JOURNAL OF PLANT PROCESS AND FUNCTION, 5(17), 121-132. SID. https://sid.ir/paper/234193/en

Vancouver: Copy

NIKNESHAN PEJMAN, TADAYYON ALI. PHYSIOLOGICAL RESPONSES OF CASTOR ECOTYPES (RICINUS COMMUNIS L.) TO DROUGHT STRESS. JOURNAL OF PLANT PROCESS AND FUNCTION[Internet]. 2016;5(17):121-132. Available from: https://sid.ir/paper/234193/en

IEEE: Copy

PEJMAN NIKNESHAN, and ALI TADAYYON, “PHYSIOLOGICAL RESPONSES OF CASTOR ECOTYPES (RICINUS COMMUNIS L.) TO DROUGHT STRESS,” JOURNAL OF PLANT PROCESS AND FUNCTION, vol. 5, no. 17, pp. 121–132, 2016, [Online]. Available: https://sid.ir/paper/234193/en

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