| 摘要 |
The invention relates to a new characteristic of lettuce which is referred to as multileaf characteristic and comprises the capacity to cause the formation in lettuce plants with a determined leaf morphology at the ready-to-harvest stage of significantly more leaves than in lettuce plants with the same leaf morphology which do not contain the characteristic. The term "significantly more" comprises: at least 1½ times as many as a lettuce type with a comparable leaf morphology, preferably at least twice as many, more preferably at least 2½ times as many, most preferably at least 200 leaves, at a ready-to-harvest stage and a determined head weight. The invention further provides a lettuce plant of the genus Lactuca in addition to a lettuce plant of the species Valerianella locusta L. (lamb's lettuce), both with the multileaf characteristic, seed of such lettuce plants and heads of lettuce.
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