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Abstract Detail


Physiological Section

Mohammed, Abdul [1], Holgate, Leon [1], Tarpley, Lee [1].

High night temperature and ethylene reception inhibition effects on rice (Oryza sativa L.) morphology, phenology and physiology.

Elevated atmospheric greenhouse gases can increase night temperatures (NT) more than day temperatures. Night temperature is one of the major environmental factors influencing plant metabolic processes and increase in NT can decrease rice (Oryza sativa L.) seed production and quality. Increase in NT increases ethylene production which in turn can trigger reactive oxygen species production, thus causing damage to the membranes, leading to a decrease in seed production. The objective of this study was to determine the effects of high night temperature (HNT) and an ethylene receptor activity inhibitor (1-methylcyclopropene; 1-MCP) on growth, development, physiology and seed production of rice plants. Plants were subjected to ambient night temperature (ANT) (25 oC) or HNT (30 oC) through use of continuously, precisely controlled infrared heaters, starting from 2000 h until 0600 h, starting 30 day after emergence . The HNT did not affect leaf photosynthetic rates; however, HNT increased respiration rates (20%), relative membrane injury (28%), internal CO2 concentration (3%), and transpiration (12%) and decreased pollen germination (34%), spikelet fertility (21%) and panicle dry weight (10%).The 1-MCP-treated plants grown under HNT showed decreased respiration (5%) and relative membrane injury (10%) and increased pollen germination (186%), spikelet fertility (28%) and panicle dry weight (4%), compared to untreated plants grown under HNT. Application of 1-MCP increased rice seed production under HNT by decreasing respiration rates and increasing membrane stability, pollen germination and spikelet fertility, providing evidence for a role of ethylene reception in rice response to HNT.

Broader Impacts:


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1 - Texas AgriLife Research, 1509 AGGIE DR, BEAUMONT, TX, 77713, USA

Keywords:
High night temperature
Rice
Respiration
Pollen germination.

Presentation Type: Oral Paper:Papers for Sections
Session: 30
Location: Westminster Room/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 11:05 AM
Number: 30010
Abstract ID:74


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