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Journal of Integrative Agriculture  2015, Vol. 14 Issue (5): 875-887    DOI: 10.1016/S2095-3119(14)60851-0
Physiology·Biochemistry·Cultivation·Tillage Advanced Online Publication | Current Issue | Archive | Adv Search |
Effects of high CO2 treatment on green-ripening and peel senescence in banana and plantain fruits
 SONG Mu-bo, TANG Lu-ping, ZHANG Xue-lian, BAI Mei, PANG Xue-qun, ZHANG Zhao-qi
1、College of Horticulture, South China Agricultural University, Guangzhou 510642, P.R.China
2、College of Life Sciences, South China Agricultural University, Guangzhou 510642, P.R.China
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摘要  Banana fruit (Musa, AAA group, cv. Brazil) peel fails to fully degreen but the pulp ripens normally at temperatures above24°C. This abnormal ripening, known as green-ripening, does not occur in plantains (Musa, ABB group, cv. Dajiao). Basedon the fact that un-completely yellowing was also observed for bananas in poorly ventilated atmospheres, in the presentstudy, the effect of high CO2 with regular O2 (21%) on banana ripening was investigated along with that on plantains at20°C. The results showed that high CO2 conferred different effects on the color changing of bananas and plantains. After6 d ripening in 20% CO2, plantains fully yellowed, while bananas retained high chlorophyll content and stayed green. Incontrast to the differentiated color changing patterns, the patterns of the softening, starch degradation and soluble sugaraccumulation in the pulp of 20% CO2 treated bananas and plantains displayed similarly as the patterns in the fruits ripeningin regular air, indicating that the pulp ripening was not inhibited by 20% CO2, and the abnormal ripening of bananas in 20%CO2 can be considered as green ripening. Similar expression levels of chlorophyll degradation related genes, SGR, NYCand PaO, were detected in the peel of the control and treated fruits, indicating that the repressed degreening in 20% CO2treated bananas was not due to the down-regulation of the chlorophyll degradation related genes. Compared to the effecton plantains, 20% CO2 Treatment delayed the decline in the chlorophyll(Fv/Fm) values and in the mRNA levelsof a gene coding small subunit of Rubisco (SSU), and postponed the disruption of the ultrastructure of chloroplast in thepeel tissue of bananas, indicating that the senescence of the green cells in the exocarp layer was delayed by 20% CO2,to more extent in bananas than in plantains. High CO2 reduced the ethylene production and the expression of the relatedbiosynthesis gene, ACS, but elevated the respiration rates in both cultivars. The up-regulation of the expression of anaerobicrespiration pathway genes, ADH and PDC, might be responsible for the subtle effect of high CO2 on the pulp ripening.Taken together, the atmosphere of high CO2 and regular O2, delayed the senescence of the green cells in the exocarp layerof the banana peel, but conferred no obvious inhibition on the pulp ripening, leading to a distinct green-ripening that wasdifferent from the phenomenon induced by high temperatures.

Abstract  Banana fruit (Musa, AAA group, cv. Brazil) peel fails to fully degreen but the pulp ripens normally at temperatures above24°C. This abnormal ripening, known as green-ripening, does not occur in plantains (Musa, ABB group, cv. Dajiao). Basedon the fact that un-completely yellowing was also observed for bananas in poorly ventilated atmospheres, in the presentstudy, the effect of high CO2 with regular O2 (21%) on banana ripening was investigated along with that on plantains at20°C. The results showed that high CO2 conferred different effects on the color changing of bananas and plantains. After6 d ripening in 20% CO2, plantains fully yellowed, while bananas retained high chlorophyll content and stayed green. Incontrast to the differentiated color changing patterns, the patterns of the softening, starch degradation and soluble sugaraccumulation in the pulp of 20% CO2 treated bananas and plantains displayed similarly as the patterns in the fruits ripeningin regular air, indicating that the pulp ripening was not inhibited by 20% CO2, and the abnormal ripening of bananas in 20%CO2 can be considered as green ripening. Similar expression levels of chlorophyll degradation related genes, SGR, NYCand PaO, were detected in the peel of the control and treated fruits, indicating that the repressed degreening in 20% CO2treated bananas was not due to the down-regulation of the chlorophyll degradation related genes. Compared to the effecton plantains, 20% CO2 Treatment delayed the decline in the chlorophyll(Fv/Fm) values and in the mRNA levelsof a gene coding small subunit of Rubisco (SSU), and postponed the disruption of the ultrastructure of chloroplast in thepeel tissue of bananas, indicating that the senescence of the green cells in the exocarp layer was delayed by 20% CO2,to more extent in bananas than in plantains. High CO2 reduced the ethylene production and the expression of the relatedbiosynthesis gene, ACS, but elevated the respiration rates in both cultivars. The up-regulation of the expression of anaerobicrespiration pathway genes, ADH and PDC, might be responsible for the subtle effect of high CO2 on the pulp ripening.Taken together, the atmosphere of high CO2 and regular O2, delayed the senescence of the green cells in the exocarp layerof the banana peel, but conferred no obvious inhibition on the pulp ripening, leading to a distinct green-ripening that wasdifferent from the phenomenon induced by high temperatures.
Keywords:  banana       plantain       high carbon dioxide       chlorophyll degradation       fruit peel senescence       fruit ripening  
Received: 08 April 2014   Accepted:
Fund: 

This work was supported by the National Key Basic Research Program of China (2013CB127105) and the National Natural Science Foundation of China (31272214).

Corresponding Authors:  ZHANG Zhao-qi, Tel: +86-20-85283413,Fax: +86-20-85280070, E-mail: zqzhang@scau.edu.cn;PANG Xue-qun, Tel: +86-20-85280195, Fax: +86-20-85282180,E-mail: xqpang@scau.edu.cn     E-mail:  zqzhang@scau.edu.cn; xqpang@scau.edu.cn
About author:  SONG Mu-bo, E-mail: songmubo1@163.com;*These authors contributed equally to this study.

Cite this article: 

SONG Mu-bo, TANG Lu-ping, ZHANG Xue-lian, BAI Mei, PANG Xue-qun, ZHANG Zhao-qi. 2015. Effects of high CO2 treatment on green-ripening and peel senescence in banana and plantain fruits. Journal of Integrative Agriculture, 14(5): 875-887.

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