Borzo Kazerani; Saied Navabpour; Hossein Sabouri; Seyedeh Sanaz Ramezanpour; Khalil Zaynali Nezhad; Ali Eskandari
Abstract
To determine the best selection indices for facilitating the selection procedure in a reproductive stage of 96 mutant lines (M2) of rice under different moisture conditions, an experiment was carried out in two environments at the research farm of Gonbad Kavous University in 2016 base on randomized complete ...
Read More
To determine the best selection indices for facilitating the selection procedure in a reproductive stage of 96 mutant lines (M2) of rice under different moisture conditions, an experiment was carried out in two environments at the research farm of Gonbad Kavous University in 2016 base on randomized complete block design with three replications. Evaluating the reduction percentage in the average values of traits showed that the most damages as affected by drought stress was due to decreases in numbers of filled grains, numbers of tillers, and 1000-grain weight. Results of stepwise regression analysis indicated that 1000-grain weight, plant height, numbers of filled grains, numbers of days to flowering, flag leaf rolling, numbers of tillers, and panicle length traits were respectively entered into the final multivariate regression model as important traits affecting grain yield under a flooded condition, and 1000-grain weight, numbers of days to flowering, plant height, fertility percentage, panicle length, flag leaf frying, and numbers of tillers were respectively entered under drought stress. Evaluation of direct and indirect effects of studied traits on the grain yield using a path analysis showed that, 1000-grain weight, due to a positive and high direct effect, and numbers of filled grains, due to an indirect effect via 1000-grain weight, can be considered as the most important traits for increasing the grain yield under flooded condition. However, 1000-grain weight and fertility percentage can be introduced as appropriate selection criteria for the grain yield under a drought condition.
Sarah Khorasaninejad; hassan soltanloo; seyedeh sanaz ramezanpour; javad hadian; Sadegh Atashi
Abstract
The current research was carried out according to a completely randomized design with three replications to study the effect of drought stress on growth parameters, essential oil constituents and yield of lavender at Gorgan University of Agricultural Sciences and Natural Resources in 2012. Five levels ...
Read More
The current research was carried out according to a completely randomized design with three replications to study the effect of drought stress on growth parameters, essential oil constituents and yield of lavender at Gorgan University of Agricultural Sciences and Natural Resources in 2012. Five levels of water deficit stress including D1 (100 percent FC, control), D2 (85 percent FC), D3 (70 percent FC), D4 (55 percent FC) and D5 (40 percent FC) were investigated during four months. Results indicated that drought stress motivated a significant influence in all of the growth parameters and essential oil yield and percent (P<0.05). In decrease in soil water lead to reduce in stem length, shoot wet weight, root wet weight and root dry weight and increase in length of root and essential oil percent, at first, and then reduction in this two parameters. Reduction in growth parameters lead to reduce in number of flower in 5th level, therefor leaves essential oil were analysed because of uniformity in results. The highest values of essential oil percent were obtained under 85percent field capacity. The most important of essential oil component is Borneol that increased. The least values of Camphor were obtained under 85 percent field capacity. Also, the medium level of drought stress caused to icrease in percent and quality of lavender essential oil. .