Bolting and Flowering Response of <i>Lactuca georgica</i>, a Wild Lettuce Relative, to Low Temperatures

• 作者: Alex Beharav Barbara Hellier
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: Gene Pools Lactuca sativa Phenological Adaptation Plant Age Vernalization Duration Wild Lettuce
• 年，卷（期）: mgzwxqkyw_2020,（12）
• 页码范围: 2139-2154
• 页数: 16页
• 分类号: O17

摘要

To learn about the phenological adaptation of <i><span style="font-family:Verdana;">Lactuca</span></i> <i><span style="font-family:Verdana;">georgica</span></i><span style="font-family:Verdana;"> Grossh., a wild relative of domesticated lettuce, we studied seed sampled accessions obtained from individual plants at 19 locations throughout six regions in Armenia, and from two natural populations in Dagestan (Russian Federation) collected as bulk samples. The effects of various vernalization treatments on time to bolting, flowering and seed production time were investigated during four successive years at different growth stages of </span><i><span style="font-family:Verdana;">L</span></i><span style="font-family:Verdana;">. </span><i><span style="font-family:Verdana;">georgica</span></i><span style="font-family:Verdana;"> plants. We demonstrate that low temperatures play a major role in stimulating the reproduction process of </span><i><span style="font-family:Verdana;">L</span></i><span style="font-family:Verdana;">. </span><i><span style="font-family:Verdana;">georgica</span></i><span style="font-family:Verdana;"> plants. Our results would suggest that for </span><i><span style="font-family:Verdana;">L</span></i><span style="font-family:Verdana;">. </span><i><span style="font-family:Verdana;">georgica</span></i><span style="font-family:Verdana;">: 1) There is an obligatory (or nearly so) vernalization requirement;2) Plant age, vernalization duration, and genotype of original sample have a role in bolting and flowering regulation;3) Some plants behaved as typical annuals, responding to vernalization treatment at the seedling stage, but, most did not;4) Four months of vernalization could be adequate to reach bolting in plants with a developed vegetative rosette, for most—but not all—samples;5) In order to find the best solution for stimulating the reproductive process of multiple genotypes, it seems that further study should focus on about 4 - 6 months of vernalization at 4°C applied to plants of about 10 - 22