SCREENING AND CHARACTERIZATION OF PHYSIOLOGICAL TRAITS IN WHEAT VARIETIES FOR NITROGEN EFFICIENCY
| dc.contributor.author | Sanghera, Amritpal Kaur | |
| dc.date.accessioned | 2017-03-02T05:25:04Z | |
| dc.date.available | 2017-03-02T05:25:04Z | |
| dc.date.issued | 2010 | |
| dc.description.abstract | A field experiment was conducted at the research farm of Department of Soils Punjab Agricultural University, Ludhiana with an objective to screen wheat cultivars (cvs) for N efficiency and determine the physiological traits for N efficiency. Fifteen wheat cvs (10 bread wheat, 3 durum wheat and 2 triticale genotypes) were grown on soil low in available N at four levels of fertilizer N (0, 50, 100 and 150 N kg ha-1). On the basis of grain yield, N uptake efficiency (NupE), Biomass N utilization efficiency (BNutE) and Grain N utilization efficiency (GNutE), three bread wheats (PBW 509, PBW 502, PBW 343) were selected as efficient and three durum wheats (PDW 274, PDW 291 and PDW 233) as inefficient cultivars. Efficient cultivars had significantly higher grain yield, NupE and GNutE while BNutE was more in inefficient cvs. Grain yield had significant positive correlation (r = 0.973) with NupE. Normalized difference vegetative index at different stages was significantly higher in efficient cultivars and had positive correlation with grain yield both at low and high N. Root distribution in the profile indicated that roots of efficient cvs penetrated into deeper layers compared to inefficient cvs which had denser root system but only in the surface layers. Nitrate reductase activity had a negative correlation with grain yield (r = -0.93) and NupE (r = -0.92) but positive correlation with BNutE (r = 0.73), suggesting that this enzyme cannot be used as index of N efficiency in wheat genotypes. Efficient cultivars had higher number of leaves and tillers, total N uptake and dry matter production than inefficient cvs. Grain yield and GNutE had positive correlation with N partitioning in grain (r = 0.75) but negative correlation with N partitioning in leaves (r = -0.77) and chaff (r = -0.76) under low N indicating that N mobilization from leaves and chaff to the grain limited grain yield and GNutE. Our study indicates the possibility of genetic modification for deeper rooting to increased N uptake, vegetative growth, biomass and grain production. Early flowering genotypes with grain filling period coinciding with favourable temperature are another characteristic of wheat development related to N efficiency. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810003538 | |
| dc.keywords | Wheat varieties, N efficiency, Nitrate reductase activity, root distribution, N partitioning, NDVI | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | Punjab Agricultural University, Ludhiana | en_US |
| dc.sub | Botany | en_US |
| dc.subject | null | en_US |
| dc.theme | wheat | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | SCREENING AND CHARACTERIZATION OF PHYSIOLOGICAL TRAITS IN WHEAT VARIETIES FOR NITROGEN EFFICIENCY | en_US |
| dc.type | Thesis | en_US |