In my experiment with chickpea, the chlorophyll content increases with advancement in growth stages...but the photosynthetic rate was highest during flowering stage, but during pod formation stage it declined though chlorophyll content increased.
Dear Dr Subham Mukherjee ,
What were the environmental, in particular illumination, conditions?
How did you measure chlorophyll concentration and in which tissues?
How did you measure the photosynthetic rate and in which tissue?
increase in leaf greenness: because of leaf enlargement and growth stop, and because of storage sinks (seeds and pods)
reduction in leaf photosynthesis: how you measured this? how many times? under which conditions? physiologically after flowering to seed filling, photosynthesis must increase
Chlorophyll was measured by ethanol extraction for the fresh leaves.. photosynthetic capacity was measured in situ with Infrared gas analyser.
We are actually doing our research on the topic 'water use pattern of chickpea under tillage irrigation and phosphorus management'...to see the effect of moisture stress we measured various physiological parameters such as relative leaf water content, chlorophyll content, proline content, photosynthetic rate, transpiration rate , stomatal conductance...
When we compared these parameters among various growth phases of chickpea, RLWC, chlorophyll content increased upto pod formation stage and then decreases. But photosynthetic rate, stomatal conductance and transpiration rate increased upto flowering stage and then decreases...this was the case under all the treatments , be it under moisture stress condition or well watered condition.
Photosynthesis is dependent on the gas exchange process and this is through the opening of stomatal pores. The operation of stomatal pores on leavs also depend on moisture; in dry season reduce exchange. Probably, at late seasons, when chlorophyll content increase due to age of the chickpea plant in the field, then the time could be dry season and photosynthesis can be affetcted/reduced. Kindly, follow the following link for further reading.
https://edepot.wur.nl/159961
Thank you, Stay Safe!
@GirmaHailemichael Thank you very much. It is indeed quite a helpful suggestion.
Because of senescence or ageing.senescence is an ordered physiological process in which cellular structures and biomolecules
are progressively broken down and the resulting products mobilized to other plant organs such as
fruits, seeds, tubers and/or more apical leaves. The most visible manifestation of leaf senescence
is yellowing caused by destruction of the chloroplast pigment-protein complexes and conversion of
the constituent chlorophylls (Chl) into catabolic non-green derivatives after opening of the chlorin ring
system. Natural leaf senescence as it occurs in the field is normally age-dependent and accelerates
upon transition of the vegetative into the reproductive growth phase.
Senescence is controlled by a genetic program involving major changes in expression patterns that
result in degradation of cells targeted for demise and reallocation of the resulting products to the newly
developing organs. Many genes induced during senescence (SAGs, for senescence-associated genes)
encode enzymes involved in protein degradation, underscoring the relevance of nitrogen recycling
during this process
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