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Mahesh Kumar Upadhyaya

Mahesh Kumar Upadhyaya_Poster Presenter at Plant Biology Conference 2020
Mahesh Kumar Upadhyaya
University of British Columbia, Canada
Title : Leaf optical properties and response of selected weeds and crops to red/far-red light ratio

Abstract:

Plants growing in canopies are exposed to reduced light intensity as well as low red/far-red (R/FR) ratio, which is a signal of impending competition. We studied effects of R/FR ratio on common lambsquarters (Chenopodium album L.), redroot pigweed (Amaranthus retroflexus L.) and tomato (Lycopersicon esculentum), how leaf optical properties for red (660 nm) and far-red (730 nm) wavelengths change with leaf position and plant development, and if pre-exposure to R/FR ratio influences response of corn (Zea mays L.), lettuce, and pigweed plants to UV-B radiation. Different R/FR ratios (0.3, 0.6, and 1.1) were achieved by using supplemental far-red LED lamps in growth chambers, while maintaining the photosynthetically active radiation. Leaf reflectance, transmittance and absorptance at red and far-red wavelengths were measured using a CI-710 Miniature Leaf Spectrometer. Different UV-B radiation treatments were achieved by filtering the radiation from UVB-313 fluorescent tubes using 1 (high UV-B), 2 (medium UV-B) and 3 (low UV-B) layers of cellulose acetate film in a glasshouse. Lamb’s-quarters, pigweed and tomato differed in their response to changes in R/FR ratio. Leaf optical properties, which can affect the R/FR ratio in plant canopies, differed with leaf position, plant development and species. These findings suggest that populations with different proportions of these species may differ in R/FR ratio in their canopies, which could impact plant-plant interactions differently. R/FR ratio pre-treatment and the associated change in anthocyanin concentration did not alter the response of corn, lettuce and pigweed plants to enhanced UV-B radiation.

Biography:

After studying at the Jawaharlal Nehru Agricultural University, India [B.Sc.(Ag)], Indian Agricultural Research Institute, New Delhi (M.Sc.), Princeton University (M.A.), and the University of Michigan (Ph.D.), Mahesh K. Upadhyaya has been working as a professor of Plant Science at the University of British Columbia. He has served as an Associate Dean and a Senator at this university and has been an Associate Editor of the Weed Science and the Canadian Journal of Plant Science. He has received many recognitions including the Excellence in Weed Science award of the Canadian Weed Science Society, Killam Award for outstanding teaching, J.F. Richard Service Award, I.A.R.I. Golden Jubilee Gold Medal, and several other prestigious fellowships and scholarships. He has published many papers in reputable journals and has supervised several masters and doctoral students. He is a Fellow of the Weed Science Society of America, the Canadian Weed Science Society, the Canadian Society of Agronomy, and the Indian Society of Weed Science.

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