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Full Research Article
Evaluation of Yield Contributing Traits in Coriander (Coriandrum sativum L.) Varieties under Drought Conditions
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Methods: The present investigation was done to assess the genetic variations among coriander genotypes for drought stress. Eight Coriander varieties viz. Rcr-20, Rcr-41, Rcr-435, Rcr-436, Rcr-446, Rcr-475, Rcr-684 and Rcr-728 were evaluated in randomized block design with three replications at the research farm of S.K.N. College of Agriculture, Jobner (Rajasthan) during Rabi, 2016. The plot was irrigated at regular interval in control condition while in drought condition plots were maintained under rainfed condition. The various morpho-physiological or yield and yield contributing parameters were recorded at maturity stages and after harvesting. The mean performance of the genotypes was decreased under drought stress in comparison to control condition for all parameters.
Result: The coriander varieties Rcr-446 and Rcr-20 were found to be drought tolerant varieties with less effect of water stress on yield contributing traits. While, coriander varieties Rcr-435 and Rcr-728 maintained higher seed yield along with number of umbels per plant, seeds per umbel, test weight, seed yield, biological yield, harvest index under control conditions. Thus, these varieties may be used as drought tolerant varieties for further investigation.
MATERIALS AND METHODS
The drought susceptibility index (DSI) was calculated according to Fisher and Maing to Fisher and Mauring to Fisher and Maururer (1978) for each genotype.
Ys = Yield of cultivar under stress.
Yp = Yield of cultivar under irrigated condition.
Ys = Mean yield of cultivar under stress.
Yp = Mean yield of cultivar under irrigated condition.
RESULTS AND DISCUSSION
Result on seed yield indicated that Rcr-446 exhibited maximum yield under control condition which was closely followed by Rcr-20 and Rcr-435. In contrast Rcr-446 exhibited maximum yield under drought condition which was closely followed by Rcr-20 and Rcr-41. The seed yield was decreased by 15.00% under drought condition (Table 1). These variations in yield were found attribute to the variations in yield contributing parameters vis-a-vis existence of drought tolerance mechanism at cellular and molecular level (Duwal et al., 2019). In present investigation the highest yield of Rcr-446 under drought condition might be on account of better performance of this variety to yield contributing parameters like umbels per plant, seeds per umbel, umbellates per umbel, test weight, biological yield and harvest index (Giridhar et al., 2014; Duwal et al., 2019).
Water stress caused decrease in biological yield as compared to non stress condition. Biological yield is an important criterion for improvement in yield, which is strongly influenced by the environment (Kumar et al., 2001). The biological yield and harvest index was decreased by 7.58% and 7.91% in drought condition. Drought susceptibility of a genotype is often measured as a function of the reduction in yield under drought stress (Blum, 1988). The lowest DSI value was found in variety Rcr-446 (0.16) followed by Rcr-20 (0.38) and Rcr-475 (0.71) indicated tolerance towards drought stress (Table 1).
CONFLICT OF INTEREST
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