Effects of Drought Stress and Rehydration on Leaf Structures and Water Conditions of Handeliodendron bodinieri Seedlings
In order to provide scientific basis for control of rocky desertification in karst areas and artificial breeding of Handeliodendron bodinieri, taking 1-year-old H. bodinieri seedlings as test materials, water param-eters of leaves under drought stress and rehydration were measured through natural drought test, and anatomical structural changes were observed to investigate effects of drought stress and rehydration on anatomical struc-tures and water contents of H. bodinieri seedlings' leaves. Results showed that from 0 to 15 days of drought stress, changes of water content, relative water content and water saturation deficit were small. On 18th day of drought stress, water content and relative water content decreased, and water saturation deficit increased. On 12th day of drought stress, free water content was the highest and bound water content was the lowest. On 18th day of drought stress, bound water content was the highest and free water content was the lowest. From 0 to 18 days of drought stress, thicknesses of upper epidermis and spongy tissues showed trends of decrease, and ratio of palisade tissue to spongy tissue and cell tense ratio showed trends of increase. Stomatal width and stomatal ar-ea showed trends of decrease. Change of stomatal length was not significant. Stomatal density showed trend of firstly increase and then decrease. After rehydration, water content, free water and bound water contents recov-ered rapidly. Stomatal width, stomatal length, stomatal density and stomatal area increased. Cell tense ratio de-creased and spongy ratio increased, which indicated that seedlings had strong drought tolerance and recovery ability after rehydration.
万方数据
维普
