biologia plantarum

International journal on Plant Life established by Bohumil Nìmec in 1959

Biologia plantarum 53:167-170, 2009 | DOI: 10.1007/s10535-009-0027-x

Diurnal changes in chlorophyll fluorescence and light utilization in Colocasia esculenta leaves grown in marshy waterlogged area

S. Roy Chowdhury1,*, Ashwani Kumar1, N. Sahoo1
1 Water Technology Center for Eastern Region, Indian Council of Agricultural Research, Bhubaneswar, India

Diurnal cycle of chlorophyll fluorescence parameters was done in Colocasia esculenta L. (swamp taro) grown in marshy land under sun or under shade. The sun leaves maintained higher electron transport rate (ETR) and steady state to initial fluorescence ratio (Fs/F0) than shade leaves. In spite of lower ETR, higher photochemical quenching (PQ), and effective quantum yield of photosystem 2 (ΦPS2) was evident in shade plants compared to plants exposed to higher irradiance. ETR increased linearly with increase in irradiance more under low irradiance (r 2 = 0.84) compared to higher irradiance (r 2 = 0.62). The maximum quantum yield of PS 2 (Fv/Fm) did not differ much in sun and shade leaves with the exception of midday when excess of light energy absorbed by plants under sun was thermally dissipated. Hence swamp taro plants adopted different strategies to utilize radiation under different irradiances. At higher irradiance, there was faster decline in proportion of open PS 2 centers (PQ) and excess light energy was dissipated through non-photochemical quenching (NPQ). Under shade, absorbed energy was effectively utilized resulting in higher ΦPS2.

Keywords: electron transport rate; non-photochemical quenching; photochemical quenching; photosystem 2
Subjects: chlorophyll fluorescence; Colocasia esculenta; diurnal courses; electron transport rate; photon flux density; quantum yield; quenching analysis; swamp taro; waterlogging; water potential; water relations, daily variations

Received: December 22, 2007; Accepted: November 15, 2008; Published: March 1, 2009  Show citation

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Roy Chowdhury, S., Kumar, A., & Sahoo, N. (2009). Diurnal changes in chlorophyll fluorescence and light utilization in Colocasia esculenta leaves grown in marshy waterlogged area. Biologia plantarum, 53(1), 167-170. doi: 10.1007/s10535-009-0027-x
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