Plant water relations and proline accumulation on two cowpea (<i>Vigna unguiculata</i> (L.) Walp.) cultivars as a response to water stress

Chiulele, R. M.; Agenbag, G. A.

doi:10.1080/02571862.2004.10635032

Cited by 8 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This implies that leaf wilting index is not an ideal discriminating trait between drought tolerant and susceptible genotypes during the early stage of water stress conditions. Nonetheless, several studies have shown that wilting signs in drought susceptible cowpea genotypes are apparent from the first week of drought stress (Muchero et al, 2008;Chiulele and Agenbag, 2004).…”

Section: Resultsmentioning

confidence: 99%

Evaluation of diverse cowpea [Vigna unguiculata (L.) Walp.] germplasm accessions for drought tolerance

Nkoana

Gerrano

Gwata

2019

View full text Add to dashboard Cite

The genetic potential for drought tolerance in cowpea within the small holder sector has not been fully exploited in South Africa. Thus, a drought evaluation experiment was conducted at the ARC-VOP to evaluate 28 cowpea germplasm accessions including two controls viz. IT96D-602 (drought tolerant) and TVU7778 (susceptible to drought) in the drought screening house using plastic box evaluation method in January, 2017. Genotypes raised for three weeks were subjected to 5 weeks of water stress treatment to determine their physiological response through leaf wilting index, relative water content and proline content followed by re-watering to determine genotype (s) with ability to recover from drought stress. Analyses of variance showed highly significant differences in response to moisture stress among the cowpea accessions for the selected physiological traits except for leaf wilting index at week two of drought stress. Stem greenness and recovery appeared to be a reliable indicator of drought tolerant genotypes which was readily observed in Acc1257, Acc1168, Acc2355, IT96D-602 and Acc5352 which also correlated significantly and positively with relative water content and proline content. The genotypes responded differently to drought stress indicating that there is sufficient genetic variability that can be utilized further in breeding for drought stress within the cowpea species.

show abstract

Section: Resultsmentioning

confidence: 99%

Evaluation of diverse cowpea [Vigna unguiculata (L.) Walp.] germplasm accessions for drought tolerance

Nkoana

Gerrano

Gwata

2019

View full text Add to dashboard Cite

show abstract

“…Studies indicate that the increase in GDH is promoted by a toxic effect of increased endogenous level of ammonia which probably accumulates due to efficient NO − 3 reduction [63,65], while GS-GOGAT cycle is the normal source of glutamate in plants [57]. Proline accumulation seems to be the main mechanism responsible for its drought tolerance in cowpea plants [57,63,66,67]. In cowpea plants measured at 9-days-of waterlog stress showed an increase in 97.3% in proline when compared to control [67].…”

Section: Discussionmentioning

confidence: 99%

Can Chlorophyll a Fluorescence and Photobleaching Be a Stress Signal under Abiotic Stress in Vigna unguiculata L.?

et al. 2022

View full text Add to dashboard Cite

Greenhouse gas emissions continue raising the planet’s temperature by 1.5 °C since the industrial age, while the world population growth rate is 1.1%. So, studies aimed at food security and better land use are welcomed. In this paradigm, we choose Vigna unguiculata to test how it would behave in the face of severe abiotic stresses, such as drought and salt stress. This study shows that under abiotic stresses V. unguiculata tries to overcome the stress by emitting chlorophyll a fluorescence and promoting photobleaching. Thus, fewer photons are directed to photosystem I, to generate lethal reactive oxygen species. The antioxidant system showed a high activity in plants submitted to drought stress but fell in salt-stressed plants. Thus, the reductor power not dissipated by fluorescence or heat was captured and converted into hydrogen peroxide (H2O2) which was 2.2-fold higher in salt-stressed V. unguiculata plants. Consequently, the malondialdehyde (MDA) increased in all treatment. Compiling all data, we can argue that the rapid extinguishing of chlorophyll a fluorescence, mainly in non-photochemical quenching and heat can be an indicator of stress as a first defense system, while the H2O2 and MDA accumulation would be considered biochemical signals for plant defenses or plant injuries.

show abstract

“…In addition, more germplasm lines need to be evaluated in order to identify new and betteradapted sources for drought tolerance. Studies conducted elsewhere have indicated that genetic variability for drought tolerance, which, could be utilized in breeding programmes, exists in cowpea (Matsui and Singh, 2003;Chiulele and Agenbag, 2004;Muchero et al, 2008). In these studies, genotypes were evaluated at different crop growth stages (seedling stage, vegetative and reproductive) using different physiological, morphological and phenological traits.…”

Section: Genetic Diversity and Methods Used For Evaluation Of Droughtmentioning

confidence: 99%

Breeding and genetic management of drought in cowpea: Progress and technologies

Mofokeng

Mashingaidze²

2019

Aust J Crop Sci

View full text Add to dashboard Cite

Cowpea [Vigna unguiculata (L.) Walp] is one of the most important leguminous crops grown in tropics and sub-tropics worldwide. It serves as a good source of proteins and minerals for nutritional benefits of both humans and animals. However, its production is hindered by recurrent drought conditions associated with climate changes. Under abnormal conditions, drought alone causes grain and fodder yield losses of about 62% and 56% of realizable yield, respectively in cowpea. Numerous efforts to mitigate drought through breeding resilient cultivars are underway in many countries. Progress is hampered due to the fact that drought is a complex trait controlled by many genes that is affected by the environment. Consequently, breeding for drought tolerance requires an integration of various knowledge systems and methodologies from multiple plant science disciplines. The success of drought tolerance depends on the accumulation of additive genes, accurate control of stress environments and the use of high throughput selection methods to maximise selection gains. This review aimed at providing perspectives on the status of the progress made thus far on cowpea drought tolerance improvement and the technologies used for genetic management of drought tolerance in cowpea in order to reduce losses incurred due to moisture stress.

show abstract

Plant water relations and proline accumulation on two cowpea (Vigna unguiculata (L.) Walp.) cultivars as a response to water stress

Cited by 8 publications

References 24 publications

Evaluation of diverse cowpea [Vigna unguiculata (L.) Walp.] germplasm accessions for drought tolerance

Evaluation of diverse cowpea [Vigna unguiculata (L.) Walp.] germplasm accessions for drought tolerance

Can Chlorophyll a Fluorescence and Photobleaching Be a Stress Signal under Abiotic Stress in Vigna unguiculata L.?

Breeding and genetic management of drought in cowpea: Progress and technologies

Contact Info

Product

Resources

About