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ThesisItem Open Access Morpho-physiological and biochemical characterization of a recombinant inbred line population of rice (Oryza sativa L.) under direct-seeded aerobic conditions(Punjab Agricultural University, Ludhiana, 2014) Cheema, Amandeep Kaur; Bedi, SeemaDirect seeding of rice (Oryza sativa L.) is a resource conservation technology but at the cost of reduction in yield. In the present study, recombinant inbred lines (RILs) obtained from a cross between PR 120 x UPLRi 7 were sown as direct-seeded aerobic and conventional transplanted crops respectively for two seasons. Various morpho-physiological, biochemical and yield related traits were studied under the two conditions. In general, plant height, dry matter, crop growth rate, relative growth rate, leaf area and chlorophyll content were lower under direct-seeded aerobic conditions than under conventional transplanted conditions. Plant height and crop growth rate showed a positive correlation with grain yield and had a direct effect on grain yield. Dry matter accumulation did not show any significant correlation but had an indirect effect on grain yield. Relative growth rate, leaf area and chlorophyll content did not show any correlation or effect on grain yield. All the yield contributing traits viz., above ground biomass, total number of tillers per 0.5m row, number of fertile tillers per panicle per 0.5m row, spikelets per panicle, grain filling percentage, grain yield per 0.5m row, harvest index, 1000 grain weight were lower and sterile grain per panicle were higher in direct-seeded aerobic condition. Above ground biomass and harvest index showed correlation with yield and had a direct effect on grain yield under both direct-seeded aerobic and conventional transplanted conditions. In general, higher sugar, starch and proline content were detected in leaves of direct-seeded aerobic crop. Out of twenty RILs under study, Ae-RIL-B-158, showed highest proline and sugar contents. Interestingly, this RIL showed least reduction in yield when sown under direct seeded-aerobic condition as against conventional transplanted condition suggesting this RIL may be more tolerant to drought stress as it accumulated highest proline and sugars under direct-seeded aerobic condition. The development of aerenchyma was comparatively more in crop raised under conventional transplanted conditions than under direct-seeded aerobic conditions. UPLRi7 (parent) showed maximum aerenchyma under direct-seeded aerobic conditions while PR120 (parent) showed maximum aerenchyma formation under conventional transplanted conditions. Under both the sowing conditions, two high-yielding RILs (Ae-RIL-B-42 and Ae-RIL-B-44) had higher aerenchyma than the two low-yielding RILs (Ae-RIL-B-7 and Ae-RIL-B-117). These characters could be used as criteria for selecting RILs for incorporating into breeding programmes for yield enhancement.ThesisItem Open Access Meristem Culture and Production of Virus Free plants of Potato (Solanum Tuberosum L.)(Department of Botany College of Basic Sciences & Humaniteis PAU, Ludhiana, 2000) Ghai, MeenuThesisItem Open Access Screening of Agro-Physiological Traits For Thermotolerance in Wheat(College of Basic Science and Humanities, Punjab Agricultural University, Ludhiana, 2008) Amandeep, Kaur; Gill, DSThesisItem Open Access Development of laticiferous tissue in some members of family apocynaceae(Department of Botany, Punjab Agricultural University, Ludhiana, 1989) Kaur, Harsimran; Sirohi, S. SThesisItem Open Access Studies of seed priming with certain growth regulators on germination and their response under stress conditions in Pigeonpea (Gajanus cajan L.)(Department of Botany, Punjab Agricultural University, Ludhiana, 1987) Kaur, Nirmaljit; Singh, ParmilThesisItem Open Access histomorphological and histochemical studies in the forestomachs in Buffalo )Bubalus bubalis)(Department of Agronomy, College of Agriculture PAU, Ludhiana, 1986) Brar, Lakhwinder Singh; Brar, Lall SinghThesisItem Open Access Effect of growth regulators on tissue differentiation in pea (pisum sativum L.) seedlings grown in saline conditions(Punjab Agricultural University, Ludhiana, 1984) Narang, Shelly; Setia, R. CThesisItem Open Access Development of ovule and embryo-A Histochemical Approach(Punjab Agricultural University, Ludhiana, 1974) Varmant, Surajeet; Malik, C. PThesisItem Restricted Studies on pollen and stigma histochemical aspecrts(College of Basic Sciences and Humanties PAU, Hissar, 1974) Pinto, Precy; Malik, C. P