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Articles by Rehana Bibi
Total Records ( 2 ) for Rehana Bibi
  Shifa Ullah , Rehana Bibi , Muhammad Amjad Bashir , Muhammad Ibrahim , Shafqat Saeed and Muhammad Arshad Hussain
  Aphid is a serious pest of wheat and other field crops. It is widely distributed in southern Punjab as well as other areas of the country. There are number of aphid species which are going to become pest of wheat crop. Experiment was conducted at farmer’s field in southern Punjab for population dynamics, number of aphid and bio-control agents (predator) recorded on weekly using diagonal method by randomly selecting 30 plants from each fields. Aphid attack started in 1st week of January in all plots and increased with the vegetative growth of plant and reached at peak level in the 3rd week of March and after that its population started to decrease and population of bio-control agents was low at start but maximum during the March when aphid population was at its peak level.
  Shahzadi Mahpara , Zulfiqar Ali , J. Farooq , Safdar Hussain and Rehana Bibi
  Yield component breeding and modification of the plant architecture offer possibilities to develop more efficient breeding systems for increased grain yield. Heterosis and heterobeltiosis studies were done at Department of Plant Breeding and Genetics, University of Agriculture, Faisalabad, Pakistan following Matzinger’ approach (1956) among seven wheat genotypes viz., Shahkar-95, Parwaz-94, Iqbal-2000, Uqab-2000, MH-97, 4072 and Punjab-96 for crosses in all possible combinations. Yield and yield related traits like plant height, number of tillers/plant, spike length, spikelets/spike, spike density, grain/spike, 1000-grains weight and grains yield/plant were investigated. Results for analysis of variance indicated significant differences among genotypes for many plant traits under study. Maximum significant heterosis (21.95%) was found in grain yield/plant followed by spike length (14.62%) and grain yield/spike (13.68%). While maximum heterobeltiosis was recorded for grain yield/plant (11.33%), followed by spike length (9.13%). It is concluded that 4072 x Punjab-96 cross showed best performance followed by Parwaz-94 x MH-97, Iqbal-2000 x parwaz-94 than other crosses under study. These crosses cab be utilized in further breeding programme as parents for contributing high yield not only under optimum environment but also under drought conditions as water use efficient crosses. The results of heterosis suggest that hybrid vigor is available for the commercial production of wheat and selection of desirable hybrid among the crosses having heterotic effects in other characters is the best way to improve the grain yield of bread wheat.
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