TY - JOUR ID - 35570 TI - Effects of water stress on germination indices in four genotypes of rangeland species Bromus tomentellus JO - Journal of Range and Watershed Managment JA - JRWM LA - en SN - 5044-2008 AU - Akhavan Armaki, Mojtaba AU - Azarnavand, Hossein AU - Asareh, Mohammad Hasan AU - Jafari, Ali Ashraf AU - Tavili, Ali AD - PhD Student Range Management, Faculty of Natural Resources, University of Tehran, Karaj, Iran AD - Associate Professor, Faculty of Natural Resources, University of Tehran, Karaj, Iran AD - Professor, Research institute of Forests and Rangelands, Tehran, Iran AD - Associate Professor, Research institute of Forests and Rangelands, Tehran, Iran Y1 - 2013 PY - 2013 VL - 66 IS - 2 SP - 167 EP - 177 KW - Drought stress KW - germination KW - genotype KW - Bromus tomentellus DO - 10.22059/jrwm.2013.35570 N2 - Environmental stress especially drought is one of the most important factors to reduce and disturbance in different stages of floral growth especially sprouting in dry and semi-dry lands of Iran. For this purpose a factorial essay executed in accidentally manner with four iterations in vitro condition. Four genotypes of Bromus tomentellus pasture types were used (92 Tehran, 630 Kordestan, 3414 Shahrekord and 9507 Lorestan) and four drought care (-3, -6 and -9 times distilled water). In this essay the sprouting percentage, Root length, Shoot length, Seedling length, Root length to Shoot length rate, Seedling dry weight, Seedling fresh weight, dry to fresh weight rate sprouting rate and seed health index were determined. The result showed that the with stress drought increase, all attributes except the dry weight to fresh weight proportion reduced significantly. The reduction in all under assessment properties were from -3 to -6 in potential. In general, in tested genotypes, Lorestan (9507) genotype showed a better sprouting in under study potentials and had a meaningful preference to other genotypes. From assessed parameters, Seedling length and seed index standard showed the most possible reaction to changing potential of water. The best levels to assess the stability to drought were the -6 and -9 load potentials in all drought levels. UR - https://jrwm.ut.ac.ir/article_35570.html L1 - https://jrwm.ut.ac.ir/article_35570_eef08f24bf4c53cc39f13cb73f6f8f17.pdf ER -