Drought resistance of sunflower in bud and seedling emergence stage

This paper had studied on different drought resistance of eleven oil sunflowers by the experiment of indoor germination and outdoor pot experiment,14 identification indexes related to drought resistance,such as relative germination index,sprout index of drought resistance and plant height were determined.The product of seeds sprout index of drought resistance and seedlings survival rate under reference number series X0 of grey relational grade analysis,according to analytical result of gray relating degree,relative germination rate,relative germination index,relative growth of bud and root,height in seeding stage,fresh weight,relative conductivity,relative water content and so on,8 drought-resistance indices were identified to estimate seedling drought-resistance characteristics.By subject function method,every identified index was able to evaluate the drought resistance strength of oil-sunflower seedlings.This research provided a scientific method for drought-resistance evaluation and identification in seedling emergence stage of sunflower.