Abstract
Diurnal changes in single leaf photosynthetic rate, leaf diffusive resistance, and stomatal conductance were observed in three sweet potato cultivars, S-108, Kanhangad, and Sree Badhra (S-1010), grown under field conditions. The highest photosynthetic rate and stomatal conductance were observed between 10.00 and 11.00 hr. The two parameters declined between 11.00 and 14.00 hr and increased between 14.00 and 15.00 hr. Stomatal resistance was low between 10.00 and 11.00 hr, increased between 11.00 and 14.00 hr and then declined between 14.00 and 17.00 hr. The diurnal variations in single leaf photosynthetic rate, stomatal conductance and diffusive resistance are attributed to changes in solar radiation, relative humidity and air temperature. There was no significant difference among the three cultivars in diurnal photosynthesis and storage root yield.
Published Version
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