Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Titre : Characterization of leaf senescence in relation to partitioning and remobilization of dry matter and nitrogen in pigeonpea (Cajanus cajan (L.) Millsp.) under two soil moisture regimes.

Auteur : Sanetra, C

Etablissement de soutenance : Georg-August-Universitat Gottingen

Grade : Magister scientiarum agrarium 1996

Introduction
Pigeonpea, also known as ’red gram’. IS one of the major gralri legume crops of the semi-arid tropics It IS w dely grown by small farmers as a subsistence crop whrcti helps to ensure a stal le ricorlie ,tad whlch can be used In rnany and diverse ways In Indla, where a high percentage of the population feeds on vegetarian food, plgeonpea IS an Important source of protein In hurnarl nutrition P geonpea IS predom nantly grown In marg nal areas wlth unfertlle solls and unrel ablc r,iinf,all bul wlthout h dh Inputs such as add tlonal supply of water and nltrogen Under such ond tlor s rnost other crops even fall to complete thew l fe cycle P geonpea plants are able to utllrze nutrients rld so11 molsture more efflclently than other crops whlle enrlchlng the so11 through riltrogeri flxatron and leaf shedd ng Effrc ent nltrogen economy IS an lmportant crop feature In the SAT where cl matrc condrtrons may adversely affect so11 properties and therefore crop growth Research on uptake, pdrtit onlng, and remoblllzat on of n trogen should lead to the mprovement In the crop’s ut llzat on eff c ency of thrs element for better yleld product on The pattern of d strlbut on and moblllzat on of nllrogen may be genetically determined and may be ut l zed as a select on crlterlon The senescence of leaves which occurs mainly during the pod filling stage is known to be related to the rernobilization of nutrients from leaves to pods. Nitrogen plays a major role as t IS an abundant element of protein structures which are broken down in leaves to be resynthesized In developrng seeds. The characteristics of leaf senescence in pigeonpea is supposed to be more compl cated than in other legumes such as groundnut or soybean but its nature and relation to environmental stress factors have rarely been studied so far.

Présentation : ICRISAT

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