Rice Tolerance to Flooding Stress on Germination Stage and Early Seedling Growth under 5 cm Water Depth

Abstract

Flood is one of the major environmental constraints that may harm plant productivity which requires specific mechanism to cope with stress. Flood prone area where rice is major crop to be cultivated, transplanting method on cultivation system cost high labor with consequence on low seedling survival. Direct seeding may offer solution for this condition with additional improvement needed on seed tolerant to germinate on anaerobic environment. An experiment was conducted to evaluate 23 rice varieties of tolerance to flooding stress on germination stage under 5 cm water depth. The experiment design was Nested -Randomized Complete Block Design with two factor and three replications. Result showed that rice germination under anaerobic condition was varied with Lambur has highest survival rates among others. Tolerance level was characterized from higher survival ability followed by high biomass accumulation and length of the shoot and root.

Seed-Soaking with Melatonin for the Improvement of Seed Germination, Seedling Growth, and the Antioxidant Defense System under Flooding Stress

“…With longer flooding times, seedling growth slows on the fourth day, with varieties that are not resistant to hypoxia continuing to grow slowly or ceasing their growth altogether [30]. In water depths of 5 cm, flood-tolerant rice varieties show higher survival abilities, higher biomass accumulation, and longer shoot and root lengths [31]. As a plant growth regulator, melatonin can promote seed germination [32].…”