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Plant, Cell and Environment 2019-Nov

Deterioration of ovary plays a key role in heat stress-induced spikelet sterility in sorghum.

Aðeins skráðir notendur geta þýtt greinar
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Krækjan er vistuð á klemmuspjaldið
Anuj Chiluwal
Raju Bheemanahalli
Vinutha Kanaganahalli
Dan Boyle
Ramasamy Perumal
Meghnath Pokharel
Oumarou Halilou
S Jagadish

Lykilorð

Útdráttur

In sorghum (Sorghum bicolor [L.] Moench), the impact of heat stress during flowering on seed-set is known, but mechanisms that lead to tolerance are not known. A diverse set of sorghum genotypes was tested under controlled-environment and field conditions to ascertain the impact of heat stress on time-of-day of flowering, pollen viability and ovarian tissue. A highly conserved early-morning-flowering was observed, wherein >90% of spikelets completed flowering within 30 minutes after dawn, both in inbreds and hybrids. A strong quantitative impact of heat stress was recorded before pollination (reduced pollen viability) and post-pollination (reduced pollen tube growth and linear decline in fertility). Although viable pollen tube did reach the micropylar region, 100% spikelet sterility was recorded under 40/22o C (day/night temperatures), even in the tolerant genotype Macia. Heat stress induced significant damage to the ovarian tissue near the micropylar region, leading to highly condensed cytoplasmic contents, disintegrated nucleolus and nucleus in the susceptible genotype RTx430. Whereas, relatively less damages to ovarian cell organelles were observed in the tolerant genotype Macia under heat stress. Integrating higher tolerance in female reproductive organ will help in effective utilization of the early-morning-flowering mechanism to enhance sorghum productivity under current and future hotter climate.

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