Effects of Low Temperature and Light Stress on Gas Exchange and Chlorophyll Fluorescence of Pumpkin Seedlings

Abstract:

Pumpkin（Cucubita pepo L.）seedlings were exposed under different low temperature-light regimes to investigate the responses of photosynthesis and chlorophyll fluorescence to the stress. The results indicated that the contents of chlorophyll increased at first day after treatment and then decreased under special temperature(15/5、20/10、25/15°C )and poor light(50、150、250μmol•m-2•s-1).The net photosynthetic rate, evaporation rate, stomata conductance and intercellular CO2 concentration increased one day after treatment and then decreased, stomata limitation increased above15/5°C special temperature and special poor light. However, under 15/5°C temperature and special poor light, the net photosynthetic rate, evaporation rate and stomata conductance decreased, and intercellular CO2 concentration increased stomata limitation increased in 4 days after treatment then decreased. Ft、Yield(F/Fm’)、qP decreased under special temperature and poor light.The change of these parameters were less under the light density of 50μmol•m-2•s-2 than other light densities, which means that poorer light reduced the sensitivity of pumpkin to low temperature and increased the photochemical activity of PS, but the photochemical quenching (qP) decreased and the non-photochemical quenching(qN) increased at the same time.

• Periodical: Advanced Materials Research (Volumes 450-451)
• Pages: 537-542
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.450-451.537
• Online since: January 2012
• Authors: En Xiang Kang, Jun Jie Luo, Hui Zhen Qiu, Nian Lai Chen, Dan Su, Bao Lin He
• Keywords: Chlorophyll Fluorescence, Cucubita Pepo L, Gas Exchange, Low Temperature and Light Stress

References

[1] Cao K Y, Wei Y Y and Wu J.2008. Shandong Agricultural Sciences. 6,pp.13-16,19. In Chinese

[2] Zhang G B and Yu J H.2006. Acta Bot. Boreal. Occident.Sin. 26 9 ,p.1770 – 1775.

[3] Duan W and Li X G . 2003. Acta Bot. Boreal.2Occident. Sin.23 6 ,pp.829-834 .

[4] Huang W Ren H Z and Zhang F M .2002. China Vegetables,4,pp.15-17 . In Chinese

[5] Yu J Z ,Li J W and Wang M P .2003. Acta A agricultural Shanghai,194,p.46 – 50. In Chinese

[6] Chen Q J ,Zhang F M and Wang Y J . 2003. Scientia Agriculturae Sinica ,361, pp.77-81.

[7] Zhang F M,MA G C.1995. Act Agirculturae Boreali-Sinica.10(1):70-75.

[8] Liu Y M.2008. JournalofAnhuiAgri.Sci.36 (13) :5274-5277.

[9] Berry JA, downton WJS. 1982. Environmental regulation of photosynthesis' in Govind J(ed) . Photosynthesis (Vol II). New York: Academic Press. 263-345.

[10] Makine A, Mac T, Chira K. 1984. Plant Physiol.25,pp.511-521.

[11] HumbeckK, Quast S, Krupinska K. 1996, Plant Cell Environ.19 pp.337-344.

[12] Zhang RX, Dai XB, Xu XM , LU W. 1999. J Nanjing Normal Univ(Nat Sci.) .22,pp.250-260.

[13] Castelfranco P A, Zeng XH. 1991. Plant Physiol.97,pp.1-6.

[14] ChenQJ,ZangFM,Wang Y J,Kurata Kenji,2003. Agricultural Sciences in China.2(2),pp.200-205.

[15] Wu S T,SunX L, China vegetables.1,pp.26-28. In Chinese

[16] COILATZ G D. 1997. Planta.134(2),pp.127-132.