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Open AccessArticle

Physiological Responses of Onion Varieties to varying Photoperiod and Temperature Regimes

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University of California, Agriculture and Natural Resources, Holtville, CA 92250, USA
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Department of Botany and Plant Science, University of California, Riverside, CA 92521, USA
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Department of Botany and Plant Science, University of California, Riverside, CA 92521, USA
*
Author to whom correspondence should be addressed.
Agriculture 2019, 9(10), 214; https://doi.org/10.3390/agriculture9100214
Received: 29 June 2019 / Revised: 24 September 2019 / Accepted: 25 September 2019 / Published: 1 October 2019
We measured the gas exchange parameters of six onion varieties in two photoperiodic regimes. The photoperiods simulated early (long-day) and late (short-day) onion growing seasons of the high desert regions near Lancaster, California. We used six locally grown onion varieties: RedBull (RB), RedWing (RW), Hybrid Cometa (HC), Granero (YG), Hybrid Valero (HV) and Hybrid SR (HS). For both photoperiod regimes, daylength and temperature were changed weekly to represent the natural progression of field growing conditions. The results show that the onion plants grown under short-daylength (SD) and higher temperature regimes exhibited higher leaf photosynthetic rates and stomatal conductance than onion seedlings grown under the long-day (LD) regime. Onion plants also had different functional leaf traits depending on crop growth environment during the onset of bulbing. The higher photosynthetic rate of the short-day plants coincided with bulb initiation. Onion photosynthesis and stomatal conductance increased at bulb initiation, apparently to provide carbohydrates for growth and storage in the bulb. View Full-Text
Keywords: onion; photoperiod; daylength; growth chambers; photosynthetic rate; bulb formation onion; photoperiod; daylength; growth chambers; photosynthetic rate; bulb formation
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Bachie, O.G.; Santiago, L.S.; McGiffen, M.E. Physiological Responses of Onion Varieties to varying Photoperiod and Temperature Regimes. Agriculture 2019, 9, 214.

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