Proline metabolism in senescing leaves of horsegram (Macrotyloma uniflorum Lam.)

Reddy, P. Sreenivasulu; Veeranjaneyulu, K.

doi:10.1016/s0176-1617(11)80150-1

Cited by 11 publications

(7 citation statements)

References 15 publications

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“…Le stress hydrique appliqué serait modéré pour les plants de gombo. L'augmentation de la chlorophylle comme celle de la proline foliaires sous l'effet du stress hydrique suggère que ces deux composés ont un précurseur commun, le glutamate (Reddy et Veeranjaneyulu, 1991). Il existerait donc des voies distinctes de biosynthèse de ces composés.…”

Section: Discussionunclassified

Effets d’un stress hydrique intervenu pendant le stade végétatif et la phase de floraison chez le gombo

Nana¹,

Tamini²,

Sawadogo³

2010

International Journal of Biological and Chemical Sciences

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RESUMECette étude a pour but d'évaluer l'impact du stress hydrique durant le stade végétatif et à la floraison sur la teneur en proline et en chlorophylle de cinq variétés de gombo. Les variations entre les différentes variétés étudiées ont été détectées. Pour cela, des plantes de cinq variétés de gombo sont cultivées sous trois traitements hydriques : une alimentation hydrique continue (T0), une restriction hydrique au stade végétatif (T1) et une restriction hydrique à la floraison (T2) ; durant ces traitements, les teneurs en proline et en chlorophylle ont été mesurées. Le stress hydrique a provoqué une augmentation de la teneur en proline foliaire chez toutes les variétés aussi bien au stade végétatif qu'à la floraison. Par ailleurs, sous l'effet du déficit hydrique aux 2 stades de développement, les cinq variétés réagissent par une augmentation du contenu foliaire en chlorophylle totale. Cependant, le rapport chlorophylle a/chlorophylle b diminue sous l'effet du stress hydrique intervenu à la floraison chez toutes les variétés. Vis-à-vis du stress hydrique au stade végétatif, les variétés UAE 19 et UAE 45 ont un rapport chloropyhlle a/chlorophylle b qui augmente, traduisant ainsi une meilleure tolérance contrairement aux variétés UAE 1, UAE 22 et UAE 40.

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Section: Discussionunclassified

Effets d’un stress hydrique intervenu pendant le stade végétatif et la phase de floraison chez le gombo

Nana¹,

Tamini²,

Sawadogo³

2010

International Journal of Biological and Chemical Sciences

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“…An alternative model for coupling proline synthesis with the PPP has been proposed where proline biosynthesis in response to stress can manage energy and reductant needs of anabolic pathways (Shetty and Wahlqvist 2004). This active metabolic role of proline could have implications for plant senescence where proline can act as an antioxidant or stimulate phenolic‐linked antioxidant response (Smirnoff and Cumbes 1989; Reddy and Veeranjaneyulu 1991; Shetty and Wahlqvist 2004). Proline is synthesized via the reduction of glutamate to Δ 1 ‐pyrroline‐5‐carboxylate (P5C) which is further reduced to proline, with both reactions using NADPH as a reductant.…”

Section: Introductionmentioning

confidence: 99%

Apple Postharvest Preservation Is Linked to Phenolic Content and Superoxide Dismutase Activity

Adyanthaya

Kwon

Apostolidis

et al. 2009

Journal of Food Biochemistry

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The postharvest preservation of apples indicated that well‐preserved varieties of apples had increased superoxide dismutase (SOD) activity initially, and the activity declined during later storage as apples deteriorated. The increased SOD activity linked to better preservation correlated with higher phenolic content and free‐radical scavenging‐linked antioxidant activity. Well‐preserved varieties were able to maintain a more stable pentose phosphate pathway (measured by the activity of glucose‐6‐phosphate dehydrogenase) throughout the storage period. Proline content increased with proline dehydrogenase (PDH) activity in the initial storage period, indicating proline catabolism supporting potential adenosine 5′‐triphosphate (ATP) synthesis. During later storage, succinate dehydrogenase activity increased, while PDH activity declined indicating a shift to tricarboxylic acid cycle and likely nicotinamide adenine dinucleotide hydrogen (NADH) generation for ATP synthesis. This shift, coupled with the declining SOD activity, coincides with rapid deterioration. The guaiacol peroxidase activity generally declined in late stages, indicating postharvest deterioration. PRACTICAL APPLICATIONS Understanding the phenolic‐linked antioxidant response during postharvest preservation of apples has implications for understanding critical control points for preservation and determination of better biochemical markers associated with preservation and long‐term storage. These insights would also help elucidate markers such as high phenolic content and antioxidant enzyme response pathways that would allow for selection and breeding of varieties that would preserve better. Higher phenolic content not only improves the postharvest storage of apples but have also shown human health benefits.

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“…Thus, it could also justify the content in lower chlorophyll a less important photosynthetic activity of plants handled by important quantities of potassium of the treatment T3 (40 g/plant in our case) compared with the plants of the treatment T2 (34 g/plant). Moreover, several works also confirm the existence of a competition between proline and the chlorophyll for the same precursor that is the glutamate [32,33]. Concerning the potassium concentration in the leaf D, the results revealed that it increases as the applied quantity of potassium increases.…”

Section: Discussionmentioning

confidence: 87%

Effect of Potassium Concentration on Some Agrophysiological Parameters of Pineapple Plants (Ananas comosus L. cv. Smooth Cayenne and MD2) Grown in Côte d'Ivoire

Souleymane

Salomé

Généfol

et al. 2018

JEAI

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Introduction:The Ivorian production of pineapple was on the decrease from 213620 t in 1999 to 30000 t in 2013. This decline in the production of pineapple would in part be linked to the quality of the fruit that is acid and especially the sensitivity of the fruit to browning enzymatic. The deterioration of the fruit quality would be due to the absence of good adequate cultural practice. Objective: The aim of this study was to determine the effect of the level of concentration of potassium applied on the physiological state of the pineapple plant. Place and Duration of the Study: The experimental tests were conducted on the

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Proline metabolism in senescing leaves of horsegram (Macrotyloma uniflorum Lam.)

Cited by 11 publications

References 15 publications

Effets d’un stress hydrique intervenu pendant le stade végétatif et la phase de floraison chez le gombo

Effets d’un stress hydrique intervenu pendant le stade végétatif et la phase de floraison chez le gombo

Apple Postharvest Preservation Is Linked to Phenolic Content and Superoxide Dismutase Activity

Effect of Potassium Concentration on Some Agrophysiological Parameters of Pineapple Plants (Ananas comosus L. cv. Smooth Cayenne and MD2) Grown in Côte d'Ivoire

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