Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L

Mean seed weight (MSW) is a relevant trait in grass pea (Lathyrus sativus L.) commercialization because large grains are preferred in Western markets. Extending the knowledge on its mode of inheritance among large-seeded types would be useful in breeding programs, and therefore it was the objective...

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Autor principal:	Mera,Mario
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2010
Materias:	grass pea heritability cool-season grain legumes
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300002
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spelling	oai:scielo:S0718-583920100003000022018-10-01Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus LMera,Mario grass pea heritability cool-season grain legumes Mean seed weight (MSW) is a relevant trait in grass pea (Lathyrus sativus L.) commercialization because large grains are preferred in Western markets. Extending the knowledge on its mode of inheritance among large-seeded types would be useful in breeding programs, and therefore it was the objective of this work. A broad range of MSW is found in grass pea, starting at about 30 mg. Three lines (LS-97, LS-8, and LS-2026) within the large-seeded group but with significantly different MSW (179, 360 and 470 mg, respectively), were crossed in a complete diallel. Part of the F1 seed was sown and the remainder was stored. F1 plants from each cross were allowed to produce F2 seed and some were backcrossed to their respective parents. Parents, F1, F2, and backcross populations were grown in the field in 2006. MSW was obtained from single plants in each population. No difference was observed between reciprocals of crosses LS-97 ’ LS-8 and LS-8 ’ LS-2026; therefore, data from reciprocals were combined, assuming nuclear inheritance. However, F2 segregating population from cross LS-97 ’ LS-2026 and its reciprocal gave significantly different means, suggesting cytoplasmic inheritance. Consequently, F2 and backcross data were handled separately to calculate heritability. Parent lines with high MSW, particularly LS-2026, had greater variances, raising the estimate of environmental variance. Broad sense heritability estimates for MSW were 0.50 and 0.32 for crosses LS-97 ’ LS-8 and LS-8 ’ LS-2026, respectively, and 0.23 and 0.24, for cross LS-97 ’ LS-2026 and its reciprocal, respectively. Narrow sense heritabilities were 0.42 and 0.28, and 0.15 and 0.22, respectively. In all crosses, the genetic effects were predominantly additive, predicting a good response to selection for increased MSW in early segregating generations. Thus, the prospects to improve MSW in large-seeded grass peas are auspicious.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.70 n.3 20102010-09-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300002en10.4067/S0718-58392010000300002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	grass pea heritability cool-season grain legumes
spellingShingle	grass pea heritability cool-season grain legumes Mera,Mario Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L
description	Mean seed weight (MSW) is a relevant trait in grass pea (Lathyrus sativus L.) commercialization because large grains are preferred in Western markets. Extending the knowledge on its mode of inheritance among large-seeded types would be useful in breeding programs, and therefore it was the objective of this work. A broad range of MSW is found in grass pea, starting at about 30 mg. Three lines (LS-97, LS-8, and LS-2026) within the large-seeded group but with significantly different MSW (179, 360 and 470 mg, respectively), were crossed in a complete diallel. Part of the F1 seed was sown and the remainder was stored. F1 plants from each cross were allowed to produce F2 seed and some were backcrossed to their respective parents. Parents, F1, F2, and backcross populations were grown in the field in 2006. MSW was obtained from single plants in each population. No difference was observed between reciprocals of crosses LS-97 ’ LS-8 and LS-8 ’ LS-2026; therefore, data from reciprocals were combined, assuming nuclear inheritance. However, F2 segregating population from cross LS-97 ’ LS-2026 and its reciprocal gave significantly different means, suggesting cytoplasmic inheritance. Consequently, F2 and backcross data were handled separately to calculate heritability. Parent lines with high MSW, particularly LS-2026, had greater variances, raising the estimate of environmental variance. Broad sense heritability estimates for MSW were 0.50 and 0.32 for crosses LS-97 ’ LS-8 and LS-8 ’ LS-2026, respectively, and 0.23 and 0.24, for cross LS-97 ’ LS-2026 and its reciprocal, respectively. Narrow sense heritabilities were 0.42 and 0.28, and 0.15 and 0.22, respectively. In all crosses, the genetic effects were predominantly additive, predicting a good response to selection for increased MSW in early segregating generations. Thus, the prospects to improve MSW in large-seeded grass peas are auspicious.
author	Mera,Mario
author_facet	Mera,Mario
author_sort	Mera,Mario
title	Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L
title_short	Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L
title_full	Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L
title_fullStr	Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L
title_full_unstemmed	Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L
title_sort	inheritance of seed weight in large-seed grass pea lathyrus sativus l
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392010000300002
work_keys_str_mv	AT meramario inheritanceofseedweightinlargeseedgrasspealathyrussativusl
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Inheritance of Seed Weight in Large-Seed Grass Pea Lathyrus sativus L

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