Stability of Solanum aethiopicum Shum accessions under varied water deficit stress levels and identification of pertinent breeding traits for resistance to water shortage
Stability of Solanum aethiopicum Shum accessions under varied water deficit stress levels and identification of pertinent breeding traits for resistance to water shortage
复制标题
DOI：
10.1007/s10681-017-2097-8
复制
发表时间：
2018-01-01
期刊：
影响因子：
1.9
通讯作者：
Kizito, Elizabeth Balyejusa
中科院分区：
文献类型：
--
作者：
Sseremba, Godfrey;Tongoona, Pangirayi;Kizito, Elizabeth Balyejusa
由于受胁迫植物的市场和营养价值的损失，干旱是对 Solanum aethiopicum 'Shum' 群体生产力的主要限制。本研究评估了 S. aethiopicum Shum 组种质，以确定在水分缺乏胁迫水平 (WL) 方面表现出色的基因型 (G)。在屏房中实施了由四个 WL 和二十个 S. aethiopicum 材料分别作为主情节和次情节因素组成的裂区安排，并重复进行了两次实验。在每个实验中，至少两个 WL 对大多数性状的至少两个种质的平均性能具有高度显着的影响，p < 0.05。此外，对于叶片相对含水量（LRWC）、每株叶片（LPP）和株高（PH），获得了非常显着的WL x G相互作用，而对于叶片长度和叶片宽度则不显着。建议作为跨 WL 稳定性优势育种性状的优先顺序为 LRWC > PH > LPP。因此，根据 LRWC，最稳定的种质被确定为种质 160，其次是种质 145、137、108P 和 184G，而最不稳定的种质被确定为种质 163G、141、163 和 108。三个抗旱育种推荐性状的广义遗传力 (H-2) 均高于 0.9，因此支持对抗旱育种的良好反应。选择。干旱胁迫对 S. aethiopicum Shum 组的性能产生负面影响，但所表现出的变异允许选择高度稳定的基因型。
Drought is a major constraint to productivity of Solanum aethiopicum 'Shum' group due to loss in market and nutrient value of stressed plants. This study evaluated S. aethiopicum Shum group accessions to identify genotypes (G) that excel across moisture deficit stress levels (WLs). A split-plot arrangement composed of four WLs and twenty accessions of S. aethiopicum as main plot and subplot factors, respectively, was implemented in a screenhouse, and repeated for two experiments. In each experiment, there was a highly significant effect of at least two WLs on mean performance among at least two accessions for most of the traits at p < 0.05. Further, very highly significant WL x G interactions were obtained for leaf relative water content (LRWC), leaves per plant (LPP) and plant height (PH), and non-significant for leaf blade length and leaf blade width. The order of priority as breeding traits for stability superiority across WLs was suggested as LRWC > PH > LPP. Consequently, based on LRWC, the most superiorly stable accessions were identified as accession 160 followed by accessions 145, 137, 108P and 184G while the least stable ones were identified as accessions 163G, 141, 163 and 108. The broad sense heritability (H-2) for each of the three recommended traits for drought resistance breeding was above 0.9 thus supportive for a good response to selection. Drought stress negatively affected the performance of S. aethiopicum Shum group but the exhibited variation allowed for selection of superiorly stable genotypes.