Effects of Water Stress on the Germination Process of Bletilla striata Under Direct Seeding Conditions
In order to address the issue of unstable germination in Bletilla striata under direct seeding conditions,we examined the impact of water stress on the germination process of B.striata.Coconut bran was used as substrate and four water content gradients were established.The result revealed that the germination process of B.striata seeds can be divided into six stages:bulbous expansion,globule turning green,first leaf growth,hairy pseudoroot growth,second leaf growth,and root growth.The result showed that the germination rate ranged from 0%to 68.3%,with higher water content leading to higher germination rates.The key stages influenced by water conditions were the globule turning green and the growth of the second leaf.Additionally,the time required for root growth ranged from 82.3 to 86.7 days,with higher water content leading to shorter germination times.The study concluded that using a higher water content substrate in the earlier stages and decreasing water content in the later stages can increase germination rates and shorten germination times in direct seeding production.
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