The Tibet Sophora Moorcroftiana Drought Resistance

Sophora moorcroftiana is a perennial legume shrubs, mainly located in the middle reaches of the Brahmaputra, is endemic in Tibet. With strong drought resistance, barren, cold resistance and anti-sand and other ecological functions. In this paper, Shannan transplanting wild seedlings, seedlings of wild and artificial Nyingchi seedling materials for the trial to determine the suitability of water under the conditions of water-retention capacity of leaves, leaf water loss and natural saturation of net photosynthetic rate; and Shannan Prefecture, the city of Shigatse and Lhasa, seedling for the test materials, selection of potted plants set up the Water Law Control of soil moisture levels of four kinds: in water the first 8d, 16d, and after rehydration 3d (Article 19d), and suitable water. In this study, by measuring different Sophora moorcroftiana seedling germination rate, chlorophyll, leaf water retention capacity, the natural leaf water saturation deficit, malondialdehyde, an acid proline, membrane permeability, determination of net photosynthetic rate, a more systematic study of the Sophora moorcroftiana planting seedlings of different drought-resistant characteristics, and preliminary study of its drought resistance evaluation. The main findings are as follows:1) Sophora moorcroftiana seed resulted in airtight, waterproof factor is actually a seed coat, pierce the seed coat or truncated part of seed coat, using emery cloth so that seed coat Pilling friction, can solve the seed coat airtight, waterproof, etc., which three kinds of methods can make the seed germination rate reached 80%. With 75% of the alcohol will soak seed 30s immediately wash with water, is to improve the see d germination rate of sand an important element.2)Water in appropriate conditions, three kinds of Sophora moorcroftiana transplanting seedlings, leaves large water-retention capacity, leaf water saturation deficit naturally smaller value, the net photosynthetic rate is a strong wild Shannan Miller, therefore, a strong drought resistance. And artificial seedlings and seedlings of wild Nyingchi water-retention capacity of smaller leaves, leaf saturated water loss value of more natural, less net photosynthetic rate, the less resistance.3)Continuous water stress and rehydration conditions, the three kinds of seedling height, diameter decreased, decreased chlorophyll content, leaf water saturation deficit of natural values become larger, plants weakened water-retention capacity, malondialdehyde content was high, leaves prolyl Histidine as an important osmolyte, the content of the rapid increase in the relative permeability of the plasma membrane become larger values, increasing the degree of membrane injury, through three kinds of Sophora moorcroftiana Miaomiao planting drought-resistance evaluation period and found that species Xigaze Drought and strong source of seedlings, followed by Shannan Prefecture provenance seedlings, seedling provenance Lhasa less drought.4) Pot of water and rehydration controlled conditions, with the strengthening of the degree of drought stress, three kinds of Sophora moorcroftiana seedling net photosynthetic rate significantly lower than that in which Xigaze robust provenance seedling growth, resistance, and drought resistance of most good. No water in before the seed source Xigaze net photosynthetic rate of seedlings is sensitive to, with the light intensity increases, the net photosynthetic rate increased in the drought stress, the apparent slow response of seedlings to light, although with the light intensity increases, but did not increase the number of healthy seedlings, drought stress increases, the trend of the more obvious, and did not reach the light saturation point.