Effect of LED Light Quality, Photoperiod and Temperature on Vegetative and Reproductive Attributes of Indoor Coriander
Talari Aravind Kumar *
Department of Vegetable Science, School of Agricultural Sciences, Malla Reddy University, Hyderabad, India.
G. Chandra Shekhar
Department of Horticulture, School of Agricultural Sciences, Malla Reddy University, Hyderabad, India.
Ch. Shanmukhi
Department of Horticulture, School of Agricultural Sciences, Malla Reddy University, Hyderabad, India.
B. Sai Krishna
R and D Department, Urban Kisaan Private Limited, Gundlapochampally, Hyderabad, India.
Mithun Chakraborty
R and D Department, Urban Kisaan Private Limited, Gundlapochampally, Hyderabad, India.
*Author to whom correspondence should be addressed.
Abstract
Controlled-environment cultivation offers the possibility of regulating light and temperature to influence coriander growth and reproductive development. This study evaluated the effects of LED light quality, photoperiod and temperature on selected vegetative and reproductive attributes of coriander (Coriandrum sativum L.) grown indoors during 2025–2026. The experiment used a completely randomised design with seven treatments and three replications. Treatments comprised red- and blue-light combinations under 16- and 18-hour photoperiods, together with two temperature regimes. Branch number was recorded at 10, 20 and 30 days after transplanting, while umbels per plant, umbellets per umbel and seeds per umbellet were assessed as reproductive attributes. At 30 days after transplanting, the 18–20 °C treatment recorded the highest number of branches per plant (12.60). The control recorded 8.53 branches per plant at 30 days, providing a comparison with the temperature and light treatments. The 2R:1B LED combination with a 16-hour photoperiod produced the highest number of umbels per plant (31.09), umbellets per umbel (7.80) and seeds per umbellet (8.52) among the reported treatments. These findings show that vegetative branching and reproductive attributes responded differently to the environmental conditions evaluated. Under the tested indoor conditions, the lower-temperature treatment favoured branching, whereas the 2R:1B light combination with a 16-hour photoperiod was associated with superior reproductive performance.
Keywords: Coriander, Coriandrum sativum L., LED light quality, red-blue light ratio, photoperiod, temperature regime, indoor cultivation, vegetative branching, reproductive attributes, seed development