An approach to increase the productivity of jatropha (Jatropha curcas L.) is to exploit hybrid
vigor of the F1 progeny for possible production of hybrid varieties. In the current study, three toxic
accessions (high phorbol ester) from each of Myanmar and Thailand were crossed with non-toxic
accession (low phorbol ester) from Mexico. Six F1 progenies and their parents were determined for the
degree of heterosis at Kasetsart University, Thailand. Individual plants from each progeny were observed
on major agronomic characters at various growth stages. Heterosis of individual characters in each
cross were calculated and tested for significance by a t-test. Four crosses showed significant heterosis in
yield per plant. Crosses showing heterosis in yield also showed heterosis in characters related to seedlings,
mature fruits, plant growth, and fruit and seed size. Superiority over mid-parent for yield per plant
ranged from 32.50% to 262.92%, and over better parent ranged from 11.74% to 195.93%. Across all
characters, crosses showing the highest heterosis over mid- parent and better parent were Myanmar 2 ×
Mexico and Myanmar 3 × Mexico.
Keywords: Jatropha curcas L., heterosis, hybrid vigor, jatropha
An approach to increase the productivity of jatropha (Jatropha curcas L.) is to exploit hybrid
vigor of the F1 progeny for possible production of hybrid varieties. In the current study, three toxic
accessions (high phorbol ester) from each of Myanmar and Thailand were crossed with non-toxic
accession (low phorbol ester) from Mexico. Six F1 progenies and their parents were determined for the
degree of heterosis at Kasetsart University, Thailand. Individual plants from each progeny were observed
on major agronomic characters at various growth stages. Heterosis of individual characters in each
cross were calculated and tested for significance by a t-test. Four crosses showed significant heterosis in
yield per plant. Crosses showing heterosis in yield also showed heterosis in characters related to seedlings,
mature fruits, plant growth, and fruit and seed size. Superiority over mid-parent for yield per plant
ranged from 32.50% to 262.92%, and over better parent ranged from 11.74% to 195.93%. Across all
characters, crosses showing the highest heterosis over mid- parent and better parent were Myanmar 2 ×
Mexico and Myanmar 3 × Mexico.
Keywords: Jatropha curcas L., heterosis, hybrid vigor, jatropha
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