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Tshwane University of Technology (2012)

Selecting 25 field-grown groundnut (arachis hypogaea l.) genotypes for symbiotic performance and drought tolerance in three locations of South Africa.

Mokgehle, Ngoakoana Salmina

Titre : Selecting 25 field-grown groundnut (arachis hypogaea l.) genotypes for symbiotic performance and drought tolerance in three locations of South Africa.

Auteur : Mokgehle, Ngoakoana Salmina.

Université de soutenance : Tshwane University of Technology

Grade : MAGISTER TECHNOLOGIAE : AGRICULTURE 2012

Résumé
Groundnut is a major grain legume in Africa, often cultivated for its oil and dietary protein. An initial breeding program on groundnut by the International Crops Research Institute for the Semi Arid Tropics selected genotypes for tolerance to foliar diseases and stressful climatic conditions in Africa. However no assessment was done on their drought tolerance and symbiotic N nutrition. This study evaluated plant growth, N2 fixation and water relations in 25 groundnut genotypes planted in three locations of Mpumalanga Province. At Nelspruit, groundnut genotypes obtained between 43 % and 59 % of their N nutrition from symbiotic fixation, with ICGV00362 and ICGV99046 fixing the most N. The data for Mzinti also showed 47 % to 67 % dependency on N2 fixation for N nutrition in groundnut genotypes. Wateruse efficiency, measured using 13C isotope in plants, revealed marked variations between genotypes and locations. Additionally, there was a significant correlation between δ15N and δ13C, thus indicating the relationship between N2 fixation and photosynthesis in symbiotic legumes. Taken together, the findings of this study show that groundnut can make a significant contribution to the N fertility of cropping systems. Because groundnut differed in their growth, symbiotic performance and water relations at Mpumalanga, wide spread testing of these genotypes is desirable to ascertain their suitability for cultivation in different parts of South Africa.

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