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Morpho-anatomical, physiological and biochemical changes in rubber tree seeds.
Genaina A DE Souza1, Denise C F S Dias2, Thaline M Pimenta1
1Departamento de Biologia Vegetal, Universidade Federal de Viçosa, Avenida Ph Rolfs, s/n, Campus Universitário, 36570-000 Viçosa, MG, Brazil.
Anais Da Academia Brasileira De Ciencias
|June 14, 2018
Summary
Rubber tree seed physiological maturity occurs 175 days after anthesis, coinciding with peak germination and vigor. This timing also shows increased heat resistant proteins and oxidative stress enzyme activity for optimal seed quality.
Area of Science:
- Agricultural Science
- Plant Physiology
- Biochemistry
Background:
- Rubber tree (Hevea brasiliensis) seed development involves complex physical, physiological, and biochemical changes.
- Determining physiological maturity is crucial for optimizing seed collection and ensuring high viability for propagation.
Purpose of the Study:
- To pinpoint the exact stage of physiological maturity in rubber tree seeds.
- To correlate seed development milestones with physiological quality indicators.
Main Methods:
- Tracking fruit and seed development from anthesis, with measurements every 15 days.
- Analyzing seed moisture content, dry matter, dimensions, ultrastructure, germination, and vigor.
- Assessing heat resistant proteins and oxidative stress enzyme activity.
Main Results:
- Fruits reached maximum size at 120 days post-anthesis; seeds at 150 days.
- Seeds gained germination capacity by 150 days post-anthesis.
- Maximum dry matter, lowest moisture, highest germination, and vigor observed at 175 days post-anthesis.
Conclusions:
- Physiological maturity in rubber tree seeds is achieved at 175 days post-anthesis.
- This stage represents the peak of physiological quality and seed viability.
- Elevated heat resistant proteins and oxidative stress enzyme activity at 175-180 days indicate adaptive responses during maturation.
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