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Accumulation dynamics of seed tocopherols in sunflower lines with modified tocopherol levels

100%

Moral L., Fernandez-Martinez J. M., Perez-Vich B., Velasco L.

Acta Physiologiae Plantarum

2013

tom 35

nr 11

Sunflower (Helianthus annuus L.) seeds have a tocopherol profile dominated by alpha-tocopherol. The objective of this research was to study the dynamics of tocopherol accumulation in sunflower lines with altered total tocopherol content or tocopherol profile. Developing seeds were sampled at regular intervals in two lines with reduced and increased total tocopherol content, respectively, and six lines with modified tocopherol profiles. The line with reduced tocopherol content showed a tocopherol accumulation rate reduced by half, whereas the line with increased tocopherol content showed a tocopherol accumulation rate twofold higher than the control. In the three cases, alpha-tocopherol followed a sigmoid accumulation pattern. Modified tocopherol profiles were expressed at early stages of tocopherol accumulation. In most lines with modified profiles, tocopherol accumulation pattern differed from the alpha-tocopherol lines, with maximum tocopherol content at 18 or 21 days after flowering (DAF) that was reduced to reach a plateau from 33 or 36 DAF onward. Such a reduction was caused by continued dry matter accumulation after tocopherol accumulation ceased or slowed down. In lines with increased levels of beta-tocopherol or both gamma- and delta-tocopherol, the synthesis of beta- and delta-tocopherol started and stopped earlier than the synthesis of alpha- and gamma-tocopherol, respectively.

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The role of mutagenesis in the modification of the fatty acid profile of oilseed crops

100%

Velasco L., Perez-Vich B., Fernandez-Martinez J. M.

Journal of Applied Genetics

1999

tom 40

nr 3

Ograniczanie wyników

1 Acta Physiologiae Plantarum

1 Journal of Applied Genetics

2 Fernandez-Martinez J. M.

2 Perez-Vich B.

2 Velasco L.

1 Moral L.

1 2013

1 1999

Wyniki wyszukiwania

Accumulation dynamics of seed tocopherols in sunflower lines with modified tocopherol levels

The role of mutagenesis in the modification of the fatty acid profile of oilseed crops