Progeny testing and identification of superior plus tree genotypes in Swietenia macrophylla and Ailanthus triphysa
Abstract
This study evaluated the growth and physiological performance of Swietenia macrophylla and Ailanthus triphysa plus tree progenies (2021–2023, Suhasini Hills, Thrissur) to identify superior genotypes. Genetic variability was observed in both species. In Swietenia macrophylla, accession FCV-SM-19 (Peruvennamuzhi) excelled in morphological traits (volume and growth rate), while FCV-SM-22 (Kottayam) showed superior physiological efficiency (photosynthetic rate and RWC). The FCV-AT-41 (Parappur) accession emerged as the overall top performer in Ailanthus triphysa. Genetic parameter analysis indicated moderate heritability for crown diameter, photosynthetic rate, and volume, suggesting significant potential for genetic gain. Strong positive correlations between growth and physiological traits confirm the value of integrating both for robust genotype selection, providing a scientific basis for the sustainable development of these commercially important species.
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