Acta Agriculturae Zhejiangensis ›› 2023, Vol. 35 ›› Issue (10): 2389-2397.DOI: 10.3969/j.issn.1004-1524.20221464

• Horticultural Science • Previous Articles     Next Articles

Effects of temperature and light intensity on photosynthetic physiology and axillary bud development of flower stalk in Phalaenopsis

XU Shenping(), YUAN Xiuyun, ZHANG Yan, LIANG Fang, JIANG Suhua, NIU Suyan, CUI Bo()   

  1. Institute of Bioengineering, Zhengzhou Normal University, Zhengzhou 450044, China
  • Received:2021-10-22 Online:2023-10-25 Published:2023-10-31

Abstract:

Temperature and light intensity are the main environmental factors affecting the growth and development of Phalaenopsis. In this study, the flowering plant of Phalaenopsis ‘Big Chili’ was used as experimental material, and the effects of two light intensity levels (photosynthetic photon flux density were 200 μmol·m-2·s-1 and 30 μmol·m-2·s-1) on photosynthesis, physiology and axillary bud development of flower stalk in Phalaenopsis were studied under high temperature (30 ℃/28 ℃) and low temperature (24 ℃/18 ℃) conditions. The results showed that the net CO2 absorption rate under high temperature with low light intensity condition (HT-LL) treatment was significantly higher than that of low temperature with low light intensity condition (LT-LL), low temperature with high light intensity condition (LT-HL) and high temperature and high light intensity condition (HT-HL) in Phalaenopsis leaves. Chlorophyll content under HT-LL treatment was significantly higher than that of LT-LL, LT-HL and HT-HL conditions. The starch content under high light intensity treatment was significantly higher than that in the low light treatment, among which the content was the highest under the HT-HL treatment and the lowest content under the LT-LL treatment; Under HT-LL treatment, the content of starch decreased first and then increased and then decreased, under LT-HL and HT-HL treatments, the content of starch fluctuated up and down. The soluble sugar content of HT-HL treatment was the highest at 7 d. After 14 d, the content of soluble sugar under LT-HL treatment was significantly higher than that under LT-LL, HT-LL and HT-HL treatments. Soluble protein content in HT-HL treatment was significantly higher than that under the other 3 treatments. In addition, combined with the developmental morphology and anatomical characteristics of axillary bud of flower stalk in Phalaenopsis, it was found that the effects of temperature and light on the axillary bud development of flower stalk were significantly different, showing two distinct developmental processes: vegetative growth and reproductive growth. The axillary buds of flower stalk were germinated and grown vegetative growth under HT-LL treatment, and grown reproductive growth under LT-HL, LT-LL and HT-HL treatments. In general, the interaction between temperature and light had a significant effect on the photosynthetic physiology of Phalaenopsis. HT-HL significantly promoted the photosynthesis of Phalaenopsis, which accelerated the axillary bud development of flower stalk in Phalaenopsis. HT-LL treatment had negative effects on photosynthetic physiology of Phalaenopsis and induced vegetative growth of axillary buds of flower stalk.

Key words: Phalaenopsis, microstructure, vegetative growth, reproductive growth, carbohydrate

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