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Leaf anatomy and photosynthetic acclimation in Valeriana jatamansi L. grown under high and low irradiance

IR@CSIR-IHBT

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Title Leaf anatomy and photosynthetic acclimation in Valeriana jatamansi L.
grown under high and low irradiance
 
Creator Pandey, S
Kushwaha , R
 
Subject Synthetic Chemistry
 
Description Relationship of leaf anatomy with photosynthetic acclimation of Valeriana jatamansi was studied under full irradiance
[FI, 1 600 μmol(PPFD) m-2 s-1] and net-shade [NS, 650 μmol(PPFD) m-2 s-1]. FI plants had thicker leaves with higher respiration
rate (RD), nitrogen content per unit leaf area, chlorophyll a/b ratio, high leaf mass per leaf area unit (LMA), and
surface area of mesophyll cell (Smes) and chloroplasts (Sc) facing intercellular space than NS plants. The difference
between leaf thickness of FI and NS leaves was about 28 % but difference in photon-saturated rate of photosynthesis per
unit leaf area (PNmax) was 50 %. This indicates that PNmax can increase to a larger extent than the leaf thickness with increasing
irradiance in V. jatamansi. Anatomical studies showed that the mesophyll cells of FI plants had no open spaces
along the mesophyll cell walls (higher Sc), but in NS plants wide open spaces along the mesophyll cell wall (lower Sc)
were found. Positive correlation between Sc and PNmax explained the higher PNmax in FI plants. Increase in mesophyll
thickness increased the availability of space along the mesophyll cell wall for chloroplasts (increased Sc) and hence
PNmax was higher in FI plants. Thus this Himalayan species can acclimate to full sunlight by altering leaf anatomy and
therefore may be cultivated in open fields.
 
Date 2005
 
Type Article
PeerReviewed
 
Format application/pdf
 
Identifier http://ihbt.csircentral.net/237/1/photo1.pdf
Pandey, S and Kushwaha , R (2005) Leaf anatomy and photosynthetic acclimation in Valeriana jatamansi L. grown under high and low irradiance. Photosynthetica, 43 (1). pp. 85-90.
 
Relation http://ihbt.csircentral.net/237/