91) and between the contents of B and Zn and the index of chlorophyll a
The use of the leaf discs from the BRS Energia and BRS Paraguacu cultivars indicated that there was a similar relationship between the degree of leaf greenness, as determined by the portable chlorophyll meter, and the chlorophyll a
content, which was extracted by the classical method.
Through resonance energy transfer; the excitation is passed on until it reaches the reaction center and one of the chlorophyll a
molecules there is excited.
We assessed the magnitude of grazing by measuring the difference in chlorophyll a
concentration inside and outside cages at the end of the study period.
Both, concentration of chlorophyll a
and chlorophyll b were increased in partially coloured bracts.
Most plants possess chlorophyll a
and chlorophyll b which are the main photosynthetic pigments (Campbell and Reece,2005).
Absorption measurements were used to quantify the chlorophyll a
, chlorophyll b, and total chlorophyll concentrations, based on the equations reported by Wellburn (1994).
In experiments in the lab, Pierce used a radioactive tracer to show that the slugs were making the pigment, called chlorophyll a
, themselves and not simply relying on chlorophyll reserves stolen from the algae.
Extraction coefficients of chlorophyll a
and b in N,N-dimethylformamide and 80% acetone.
We measured gross primary production (GPP) and chlorophyll a
concentration at two stations in each of five estuaries of Waquoit Bay (Childs River, Quashnet River, Jehu Pond, Hamblin Pond, and Sage Lot Pond).
The absorbance values (A663, A646 and A470) of the extracted solution were measured using UV-visible spectrophotometer at the wavelength of 663nm, 646nm and 470nm, the concentration (mg L-1) of chlorophyll a
(Chl a), chlorophyll b (Chl b) and carotenoid (Cx.
This crop suffering water stress resulted in decreased seed yield, chlorophyll a
, chlorophyll b, chlorophyll concentration, and yield per hectare and stomatal Conductance.
Data of various physiological (leaf chlorophyll a
and b, proline and protein contents) and agronomic attributes (number of pods/plant, seeds/pods, grain yield/plant) was recorded.
Leaf chlorophyll a
/b ratios were determined by dividing the chlorophyll a
concentration by that of chlorophyll b.
These results indicated that the yellow- green leaf color o f burley tobacco was not the result of imbalance in content ratio between chlorophyll a
and chlorophyll b, but the abnormal lower content of total chlorophyll in its leaves.