Tomasi Pernell, Abdel-Haleem Hussein
USDA-ARS, US Arid-Land Agricultural Research Center, 21881 North Cardon Lane, Maricopa, AZ 85138, USA.
Plants (Basel). 2023 Oct 29;12(21):3716. doi: 10.3390/plants12213716.
has received considerable attention as a renewable biofuel crop for semi-arid zones due to its high oil content and polyunsaturated fatty acids contents. It is important to develop new drought-resistant cultivars of production to expand its areas into more arid regions. The accumulation of leaf cuticular wax on plant surfaces is one mechanism that reduces non-stomatal water loss, thus increasing drought resistance in plants. To explore phenotypic variations in cuticular wax in , leaf waxes were extracted and quantified from a diversity panel consisting of 315 accessions. The results indicate that the accessions have a wide range of total leaf wax content (289-1356 µg dm), wax classes, and their components. The C and C homologues of alkanes, C ketone homologue, C secondary alcohol, and C aldehyde were the most abundant leaf waxes extracted from accessions. The high heritability values of these waxes point to the positive selection for high wax content during early generations of future breeding programs. Positive correlation coefficients, combined with the effects of these waxes on leaf wax content accumulation, suggest that modifying specific wax content could increase the total wax content and enhance cuticle composition. The identified leaf wax content and compositions in will lead to the future discovery of wax biosynthetic pathways, the dissection of its genetic regulatory networks, the identification of candidate genes controlling production of these waxes, and thus, develop and release new drought-tolerant cultivars.
由于其高含油量和多不饱和脂肪酸含量，作为半干旱地区的一种可再生生物燃料作物受到了广泛关注。开发新的抗旱品种以将其种植区域扩展到更干旱地区很重要。植物表面叶表皮蜡质的积累是减少非气孔水分损失从而提高植物抗旱性的一种机制。为了探索[作物名称]叶表皮蜡质的表型变异，从由315份种质组成的多样性群体中提取并定量分析了叶蜡质。结果表明，这些种质的叶蜡质总量（289 - 1356微克/平方分米）、蜡质类别及其成分具有广泛的差异。从[作物名称]种质中提取的最丰富的叶蜡质是烷烃的C和C同系物、C酮同系物、C仲醇和C醛。这些蜡质的高遗传力值表明在未来[作物名称]育种计划的早期世代中对高蜡质含量进行了正向选择。正相关系数，以及这些蜡质对叶蜡质含量积累的影响，表明改变特定蜡质含量可以增加总蜡质含量并改善角质层组成。在[作物名称]中鉴定出的叶蜡质含量和组成将有助于未来发现蜡质生物合成途径、剖析其遗传调控网络、鉴定控制这些蜡质产生的候选基因，从而培育并推出新的[作物名称]耐旱品种。
