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Accueil du site → Doctorat → Inde → 2008 → Biochemical mechanisms of resistance to shoot fly, atherigona soccata (rondani) in sorghum, sorghum bicolor (l.) Moench.

Jawaharlal Nehru Technological University (2008)

Biochemical mechanisms of resistance to shoot fly, atherigona soccata (rondani) in sorghum, sorghum bicolor (l.) Moench.

Chamarthi, S K

Titre : Biochemical mechanisms of resistance to shoot fly, atherigona soccata (rondani) in sorghum, sorghum bicolor (l.) Moench.

Auteur : Chamarthi, S K

Etablissement de soutenance : Jawaharlal Nehru Technological University

Grade : PhD thesis 2008

Résumé
Sorghum is the fifth major cereal crop after wheat, rice, corn, and barley, and third important cereal crop after rice and wheat in India. Nearly 150 insect species have been reported as pests on sorghum, of which sorghum shoot fly, Atherigona soccata, is an important pest. Host plant resistance is one of the important components for managing this pest, and therefore, the present studies were undertaken on biochemical mechanisms of resistance to shoot fly to strengthen host plant resistance to this insect for sustainable crop production. Genotypes IS 2312, SFCR 125, SFCR 151, ICSV 700, and IS 18551 exhibited antixenosis, antibiosis, and tolerance components of resistance to shoot fly, A. soccata. There was a significant variation in the leaf surface wetness, leaf glossiness, trichome density, seedling vigor, plumule and leaf sheath pigmentation, days to 50% flowering, and plant height among the test genotypes. Transplanting and clipping of sorghum seedlings reduced shoot fly damage. There was no effect of p-hydroxy benzoic acid (PHBA), p-hydroxy benzaldehyde (PHB), Cu2So4, KI, and 2, 4- D on shoot fly damage. However, application of PHBA showed increase in egg laying by the shoot fly females. Sorghum genotypes with high amounts of soluble sugars, more leaf surface wetness and fats, and better seedling vigor were susceptible to shoot fly ; while those with glossy leaf trait, pigmented plumule and leaf sheath, tall with high trichome density ; and high tannin, Mg, and Zn contents showed resistance to shoot fly. Leaf surface wetness, Mg, Zn, soluble sugars, tannins, fats, leaf glossiness, leaf sheath and plumule pigmentation, and trichome density explained 99.8% of the variation for deadhearts, of which leaf glossiness, plumule pigmentation, trichomes, and fat content had direct effects and correlation coefficients for iii deadhearts in the same

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