ACTA HORTICULTURAE SINICA ›› 2017, Vol. 44 ›› Issue (4): 691-702.doi: 10.16420/j.issn.0513-353x.2016-0418

• ARTICLE • Previous Articles     Next Articles

Effect of Different LED Light Qualities on the Photosynthesis and Tuberization of Virus-free Potato in Hydroponic Culture

TANG Daobin1,2,3,ZHANG Xiaoyong1,*,WANG Jichun1,2,3,**,JIANG Yuchun1,JING Fu1,LUO Yulong1,BAI Hui1,HUANG Tingrong4,SHU Jinkang5,and CHEN Yongchun5   

  1. (1College of Agronomy and Biotechnology,Southwest University,Chongqing 400716,China;2Engineering Research Center of Southern Mountain Agriculture,Ministry of Education,Southwest University,Chongqing 400716,China;3Potato Engineering and Technology Research Center,Chongqing 400716,China;4Youyang Agriculture Commission,Chongqing 408800,China;5Wuxi Agriculture Commission,Chongqing 405800,China)
  • Online:2017-04-25 Published:2017-04-25


The differences of virus-free potato’s plant leaf growth,photosynthesis,chlorophyll fluorescence and tuberization in different light qualities were studied. Taking white light as control,the red light,red + blue light generated by light-emitting-diode were applied to study the influences of different LED light qualities such as white,red,blue,red/blue(71)and red/blue(51)on favorite virus-free potato plantlet. It showed that,under different light qualities,there were differences in photosynthesis and tuberization:the red/blue(51)treatment resulted in better leaf area index,chlorophyll content,stomatal density,CiqPTr and ΦPSIIcompared with white light treatment;remarkably-improved PnGsand ETR;earliest tuberization compared with white light treatment. However,the contents of chlorophyll decreased,Pn and ΦPSII remarkably-decreased on the 60th day. It matured ahead of time with lower stolon. The micro-tuber yield and tuberization rate are the highest. Red light treatment resulted in decreased leaf area index,chlorophyll content,GsPnFv/FoΦPSII and qP,increased NPQ,slow-down tuber formation and lowest final yield. Furthermore,the blue light treatment was inhibit the formation of stolon and the limit the number of micro-tuber per plant. The analysis indicated that higher red light proportion in light quality can promote the formation of stolon while higher blue light proportion can promote the tuber formation and expansion,shorten the production cycle. Basing on the results,it is advisable to increase the red light proportion in the earlier stage of light adjustment to induce the formation of stolon,and to increase the blue light proportion in the late period to promote the tuber formation and expansion,increase the number and yield of tuber.

Key words: virus-free potato, micro-tuber, hydroponic culture, LED light quality, photosynthesis, chlorophyll fluorescence, tuberization

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