Abiotic factors, such as temperature and drought, are the main factors limiting the cultivation under the tropical condition. Two-stage experiments were conducted to examine the drought-tolerant potential of some wheat genotypes against the osmotic stress under the tropical condition at the Laboratory and Greenhouse of Hasanuddin University and Indonesian Cereal Research Institute. The experiments were arranged in a randomized block design with the split-plot pattern and respectively provided with four and three replications. The main plot was potential osmotic stress (0, -0. 33 , and -0.67 MPa) and the sub-plot was selected wheat genotypes (17 genotypes). The results indicates that based on the germination percentage, shoot/root ratio, proline content, stomatal behavior, and relative water content, the wheat lines of O/HP-78-A22-3-7, WBLL*2KURUKU, O/HP-6-A8-2-10, and O/HP-22-A27-1-10 are identified to have better drought-tolerance than the others genotypes based on the analysis of responses to parameters observed. The positively adaptive response of some tropical wheat genotypes to drought stress may be used as a potential donor for further development of drought-tolerant wheat varieties under the tropical climate in Indonesia.
High temperature stresses is a challenge for developing the wheat in tropical environments and affect each stage of plant development. Therefore, early detection of yield characteristics using high-temperature linked markers is necessary in order to produce adaptive varieties in tropical environments. The purpose of this study was to detect differences in the formation of band patterns from tropical wheat populations from field selection using SSR markers for heat tolerant. This experiment used 10 selected genotypes and tested with 10 SSR markers for heat tolerant. The results showed that from 10 SSR primers only 2 primers showed a difference in band size, namely on the XGWM285 and XBARC197 primers which were formed only in OHP12a1-1-9 genotypes.Keywords : Tropical wheat, Simple sequence repeat (SSR) marker, heat tolerant, Genotypes
The assimilation products produced by the leaves will be distributed to all parts of the plant that need it. The presence of leaves can help smooth assimilation, but can also be a user of assimilate products. The removal of leaves under the cob is done to streamline the process of photosynthesis that occurs in old leaves that cause moisture, it is also intended to suppress the occurrence of internal competition in assimilation, while the need to be given the right fertilizer or nutrition for the growth and production of corn which is needed, namely Nitrogen in Urea Fertilizer. This study aims to analyze the growth and production of three varieties of corn with the application of different doses of urea fertilizer and leaf shredding under the cob. The research was conducted in the form of a multifactor experiment arranged based on a Split Split Plots Design (SSP) in a Randomized Group Design (RAK) pattern consisting of the Main Plots Factor (MP), namely Maize Variety Type consisting of Agricon, BISI-10,and C7 Varieties. Sub Plots (SP) are doses of urea fertilizer of 250 kg.ha-1 and 350 kg.ha-1 respectively, and Sub Sub Plots (SSP) are the method of leaf trimming under the cob consisting of No trimming. Composting at anthesis, and Composting 1 week after anthesis. The results of the analysis showed that the Bisi-10 variety gave a better response to the dose of urea fertilization at the vegetative growth stage of corn plants and the Agricon variety gave a better response to urea fertilization and pumping time at the generative growth stage, the dose of urea fertilizer 350 kg ha-1 gave a better response to the growth and development of corn plants and corn plant production and the time of pumping the leaves under the cob at the time of pollination was more effective in increasing the quality and quantity of corn plant production.
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