Title: Physiological Responses to Rice Plant under Upland Farming with Mulching
Abstract: Pot experiments are conducted to distinguish nitrogen nutrition characters of rice and adaptation to continuous water stress with the two main treatments: waterlogged soil condition and upland soil condition either by covering straw or film. Compared with rice on waterlogged soil condition, dry matter ratios of root to shoot, leaf length, maximum root length, average root length, and root dry matter weight decrease, with a considerable increase, white root number and ratios of white root number to total root number, however. In addition, quantities of thin roots and root hairs are found from the roots of rice in upland farming. Compared with rice on waterlogged soil condition, the active absorption areas of roots, the activity of glycolic acid oxidase in leaves, the contents of chlorophyll a, b and a+b, the contents of NRA and NO3N both in leaves and roots increase significantly during nursery seedling stages in upland farming. Net photosynthesis rate diminishes obviously while ratios of chlorophyll a to b have little changes. From the youngpanicle differentiation to heading stages, NRA, NO3N, chlorophyll a, b and total content of rice plant maintaine higher levels, whereas ratios of chlorophyll a to b decrease by 0.12 units. Net photosynthesis rate tends to be the same as those in waterlogged soil condition. Endogenous hormone of rice has greater changes in upland farming than in waterlogged cultivation. ABA both in roots and in leaves and GA1/3 in roots of rice cultivated in upland soil increase obviously at the youngpanicle differentiation stage, whereas GA1/3 and iPA in leaves and iPA in roots of rice cultivated in upland soil diminishe significantly. IAA in roots of hybrid rice, Shanyou 63, increase to a great extent, but the reverse is true for upland rice 8515. At the maturing stages of rice,IAA and GA1/3 in leaves, iPA in roots increase significantly while ABA in roots and in leaves decreases to some extent. There are significant differences in GA1/3 and IAA in roots and iPA in leaves among the varieties tested.
Publication Year: 2003
Publication Date: 2003-01-01
Language: en
Type: article
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