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Experimental Protocol for Manipulating Plant-induced Soil Heterogeneity
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Heterosis for Interactions between Insect Herbivores and 3-Line Hybrid Rice under Low and High Soil Nitrogen
Finbarr G Horgan1,2,3, Carmencita C Bernal4, Angelee Fame Ramal5
1EcoLaVerna Integral Restoration Ecology, Bridestown, Kildinan, Co., T56 P499 Cork, Ireland.
Insects
|June 26, 2024
Summary
Hybrid rice breeding can achieve high herbivore resistance and tolerance, even without heterosis or heterobeltiosis. Nitrogen management influences resistance and tolerance, impacting pest control strategies in rice cultivation.
Area of Science:
- Agricultural Science
- Entomology
- Plant Breeding
Background:
- Hybrid rice systems utilize male-sterile (A) lines crossed with pollen donors (R lines), often requiring a B line for A line maintenance.
- Heterosis (hybrid vigor) and heterobeltiosis (superior hybrid performance over parents) can enhance traits like growth, yield, and pest resistance in hybrid rice.
- Understanding plant tolerance, the ability to compensate for herbivore damage, is crucial for effective pest management.
Purpose of the Study:
- To investigate the frequency of heterosis for resistance and tolerance to key rice herbivores in eight hybrid varieties.
- To evaluate the impact of varying soil nitrogen levels on herbivore resistance and plant tolerance.
- To determine if heterosis/heterobeltiosis are prerequisites for high herbivore resistance or tolerance in hybrid rice.
Main Methods:
- Greenhouse experiment assessing eight rice hybrids against brown planthopper (BPH), whitebacked planthopper (WBPH), and yellow stemborer (YSB).
- Evaluation of plant biomass loss due to herbivore feeding as a measure of tolerance.
- Analysis of herbivore resistance and tolerance under different soil nitrogen conditions.
Main Results:
- Nitrogen application decreased resistance to all three herbivores but enhanced tolerance to WBPH and YSB, indicated by improved plant survival, growth, and yield.
- High nitrogen levels reduced biomass loss per unit of WBPH, with some hybrids showing overcompensation.
- Heterosis and heterobeltiosis were not consistently linked to superior herbivore resistance or tolerance across the evaluated hybrids.
Conclusions:
- Nitrogen management can be a tool to enhance rice tolerance to certain herbivores, despite potentially reducing resistance.
- High herbivore resistance and tolerance in hybrid rice can be achieved independently of heterosis or heterobeltiosis.
- These findings offer insights for integrated pest management strategies in hybrid rice cultivation, particularly concerning nitrogen fertilization.
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