Effect of daminozide on heading formation, physiological and biochemical changes in Theinchin chinese cabbage [Brassica campestris L. spp. pekinensis (Lour) Olsson] grown during off-season [in Thailand]
1984
Krissanapan Manapee
Effect of daminozide on yield, physiological and biochemical changes of Theinchin Chinese cabbage was studied and compared to standard heat tolerance of Chinese cabbage variety B 189 during off-season. The experiment consisted of two parts. The first part was conducted to find out a suitable number and timing of application of 2,000 ppm daminozide The 2,000 ppm daminozide was applied by foliar application to Chinese cabbage plants after transplanting 20, 25, 30 and 35 days for 1, 2, 3 and 4 times at 4 -day interval. The second part was conducted by using the best result from the first part to compare physiological and biochemical changes between treated and nontreated plants of Theinchin and standard heat tolerance of Chinese cabbage variety. The head weight of Theinchin Chinese cabbage was maximally increased up to 41.67% over the control, when one application of 2,000 ppm daminozide was given to Chinese cabbage after they had been transplanted for 30 days. Plant from the best treatment had higher number of inner leaves, total number of leaves, plant fresh weight, inner leaves weight and number of lateral shoots. In The second experiment, though both treated and nontreated Chinese cabbage plants formed head 100% but daminozide had no effect on plant weight, head weight and head size. In fact, daminozide decreased head weight of B 189. This may be due to very high temperature and daminozide had a more negative efffect on the growth and development of Chinese cabbage. Daminozide had no effect on the number of stomata, number of inner and outer leaves, chlorophyll content, total soluble solids of leaf blade and petiole, electroconductivity, relative water content, total nonstructural carbohydrate, reducing sugar and dry weight of leaves
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