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Accueil du site → Doctorat → Inde → 2006 → Genetic Variability, Stability and Inheritance of Grain Iron and Zinc Content in Pearl Millet (Penniserurn glaucum (L.) R. Br.)

Tamil Nadu Agricultural University (2006)

Genetic Variability, Stability and Inheritance of Grain Iron and Zinc Content in Pearl Millet (Penniserurn glaucum (L.) R. Br.)

Velu, G

Titre : Genetic Variability, Stability and Inheritance of Grain Iron and Zinc Content in Pearl Millet (Penniserurn glaucum (L.) R. Br.)

Auteur : Velu, G

Etablissement de soutenance : Tamil Nadu Agricultural University.

Grade : PhD thesis 2006

Résumé
The prcscnt study was undcrtakcn to determlnc thc niagnitudc of gcnctic v ; rlahtl ly for grain iron (Fe) and zinc (Zn) anlong a divcrsc rangc of hrccding lines, niprovc(l populat ons( anlong and withln populal ons)a nd gcrniplasni acccssions ; to assess thc stabll ty across different envlronnicnts ; to cxanilnc thc rclationshlps hctwccn thcm and with days to 50% flower and 1000-grain mass ; and to determine the nalure of inhcr tancc and heritab l ty. Over two-fold vanat on was found for hoth gram Fc (30.1 75 7 mg kg I) and %n content (24.5-64.8 my k g 1 )w ith medium to h ghb road-scnsc hcr tahilityi n diffcrcnt classes of brccdtng materials and unproved populations (42.0 79.0 rng kg" Fc and 24.2-51.7 mg kg’’ Zn), indicating large gcnctlc varlahllity for thc in provcmcnt of gram Fe and Zn content and the scope for efiietive selection. The highest lcvels of Fc mid Zn content were observed in well-adapted commercial varieties and in thc p : rcnt ; lli nes of released hybrids, which had large rnradr pmiplasrn base in their parentage, suggcstitig [he possibility of making imrncdlalc impact on the nutritional security. Large u lhlnpopulauon variab lity of ovcr two-fold for gram Fc (40.0 118.9 nip kg") and Zn (31.8 82.7 mg kg") content was detcc cdin pmgcntcs derived froni two open-poll nated varieties (AIMP 02901 and GU 8735). ttidicating possibility of sclcct on withinpopulatton and the prospects of enhancing gram Fe and Zn levels by recurrent sclectio i. The d fference between the sunimer and ralny season for grain Fe and %n contcnt among the entnes was largely due to thc soil Fe and Zn content of thc liclds lscil in Ihc crpenments. The pos tive and highly significant correlation hetwccn Fe and %n contcnt in oll thc expennicnts, ind catcd the possibtlity of simultaneous gcnctlc iniprovcmcnt fbr the elevated levels of both m cronutricnts. Stgntlicnnt positive correlations of 1000-pr:lin mass and negative correlation of days to 50% flower with Fc and %n contcnt suggcstcd good prospects of combining high Fc and Zn w thf amicrs-preferred tralts such i sla rgc seed sire atid carly ma urity............

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Page publiée le 23 septembre 2012, mise à jour le 2 février 2021