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Responses of Quality Development of Carrot to Soil Temperature and Moisture

Author: LiuLu
Tutor: ChenNianLai
School: Gansu Agricultural University
Course: Olericulture
Keywords: Carrot Soil temperature Drought Stress Physiological Quality
CLC: S631.2
Type: Master's thesis
Year: 2010
Downloads: 52
Quote: 0
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Abstract


Carrots commonly known as \Carrot variety \chlorophyll, MDA, soluble protein, soluble sugar and proline content, superoxide dismutase, peroxidase, ascorbate peroxidase activity and photosynthetic characteristics, the determination of the harvest period fleshy root, carrots B-carotene , soluble solids, vitamin C, cellulose, hemicellulose content and stem proportion of the soil temperature and moisture on the growth of carrots, quality formation and the impact of physiological and biochemical characteristics. The results are as follows: 1 carrot vegetative growth period, covering the transparent film and black film could significantly increase soil temperature, average daily soil temperature increased by 4.31 ° C and 3.28 ° C, respectively, than no coverage. 2, T3 compared to (cover transparent film, April 20 planting) and T4 (covering the black film, the growth rate of the April 20 planting) and T2 (not overwrite, April 20 planting) were significantly increased, and T3 growth rate is greater than T4. T1 (not covered with the slowest growth of 5 April sowing). Soil temperature treatment was no significant difference in vitamin C content. T1 stem the smallest percentage. After covering the transparent film, B-carotene, soluble solids, the hemicellulose content was significantly increased to improve the quality of carrot. 3, with the soil temperature rises, the performance of malondialdehyde (MDA) and soluble protein content trend for first decreased and then increased; performance trend for the first and then decreased soluble sugar content, proline is manifested straight up; SOD POD activity showed increasing trend. 4 of drought stress on the growth of carrot plants play an inhibitory effect severe drought carrots growth inhibition of the most obvious. Drought stress, carrots quality change the proportion of the central pillar, soluble solids, cellulose and hemicellulose content increases with the strengthening of its drought stress, B-carotene and vitamin C content showed decline, edible the decline in value. Different drought stress under carrots malondialdeyde content with stress time performance decrease - increase - decrease trend, indicating that the membrane integrity destruction. Osmotic adjustment substances (soluble sugar, soluble protein, proline content), and antioxidant enzymes (SOD, POD, APX) activity gradually increased with stress time performance, when the soil moisture content of 65%, an increase of the most. Photosynthesis of more and more obvious that this change coincided with the chlorophyll content, chlorophyll content reduced photosynthetic rate decreases, reduced photosynthetic products.

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CLC: > Agricultural Sciences > Gardening > Vegetable gardening > Root vegetables ( taproot class ) > Carrot
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