Gene action governing the inheritance of drought tolerance and selected agronomic traits in Ugandan groundnut (Arachis hypogaea L.) lines under drought environment

Kakeeto, Ronald; Melis, Rob; Biruma, M.; Sibiya, Julia

doi:10.1007/s10681-019-2539-6

Cited by 23 publications

(1 citation statement)

References 38 publications

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“…D is a devastating physical stress and more challenging to the attempts of breeders (Tuberosa & Salvi, 2006). Breeding drought tolerance in groundnuts cultivars would reduce yield losses due to D in rain-fed growing areas (Kakeeto et al, 2020). Breeding works to develop drought tolerance have been hampered in the past by its quantitative genetic base and by low understanding of the physiological base of productivity under D (Passioura, 2002).…”

Section: Introductionmentioning

confidence: 99%

DIFFERENTIAL RESPONSES OF CERTAIN ETHIOPIAN GROUNDNUT (Arachis hypogaea L.) VARIETIES VARYING IN DROUGHT TOLERANCE, TO TERMINAL DROUGHT STRESS

Jeyaramraja¹,

Woldesenbet²

2020

JEBAS

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Responses of drought tolerant (DT) and drought susceptible (DS) Ethiopian groundnut varieties to terminal drought stress were compared to determine the traits behind drought tolerance. Drought (D) induced from 91 to 105 days after sowing (DAS) reduced leaf RWC (relative water content, %), leaf area (cm 2 plant -1 ), Chl (chlorophyll, mg g -1 fresh weight), RDM (root dry mass, g plant -1 ), ADM (aboveground dry mass, g plant -1 ), TDM (total dry mass, g plant -1 ) and plant height (cm); however, D increased SLM (specific leaf mass, g m -2 ). High leaf RWC in DS types reinstated the hypothesis that capacity to save leaf water is not a method of drought tolerance. Although there were insignificant Chl differences between DT and DS types, dry matter accumulation (RDM and ADM) was higher in DT types, which is attributed to higher SLM in DT types. SLM had significant positive relationship with RDM. An increase in plant height without increase in leaf area explains drought susceptibility in DS types. Resumption of irrigation on 106 DAS resulted in an increase in leaf RWC; however, this accompanied no resurrection response in terms of studied physiological and growth parameters and thus, it was not possible to restore pod yield after D impaired groundnut growth. Certain parameters were higher in DT types, positively correlated with DRI (drought response index) and primarily decided by the genotype; such parameters were concluded to be the traits behind drought tolerance.

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Section: Introductionmentioning

confidence: 99%