Sterling Armando, Guaca-Cruz Lised, Clavijo-Arias Edwin Andrés, Rodríguez-Castillo Natalia, Suárez Juan Carlos
Phytopathology Laboratory, Faculty of Basis Sciences, Sinchi Amazonian Institute of Scientific Research, Universidad de la Amazonía, Florencia 180001, Caquetá, Colombia.
Natural Sciences and Sustainable Development, Faculty of Agricultural Sciences, Universidad de la Amazonía, Florencia 180001, Caquetá, Colombia.
Plants (Basel). 2021 Oct 28;10(11):2320. doi: 10.3390/plants10112320.
The objective of this study was to evaluate photosynthetic performance based on gas exchange traits, chlorophyll fluorescence, and leaf water potential () in nine genotypes from the ECC-1 (Élite Caquetá Colombia) selection and the cultivar IAN 873 (control) in response to different climatic (semi-humid warm and humid warm climates), seasonal (dry and rainy periods), and hourly (3:00 to 18:00) variations that can generate stress in the early growth stage (two-year-old plants) in two large-scale clonal trials in the Colombian Amazon. The photosynthetic performance in 60% of the Colombian genotypes was slightly affected under the conditions with less water availability (dry period, semi-humid warm site, and between 9:00 and 15:00 h), as compared with IAN 873, whose affectation was moderate in terms of photosynthesis rates, but its water conservation strategy was strongly affected. The ECC 90, ECC 83, and ECC 73 genotypes had the best photosynthetic performance under conditions of greater water limitation, and ECC 35, and ECC 64 had a higher water status based on the leaf water potential, with intermediate photosynthetic performance. This germplasm has a high potential for selection in rubber tree breeding programs in future scenarios of climate change in the Colombian Amazon.
本研究的目的是基于气体交换特性、叶绿素荧光和叶片水势（），评估来自ECC - 1（哥伦比亚卡克塔精英）选系的9个基因型以及品种IAN 873（对照）在哥伦比亚亚马逊地区两个大规模无性系试验中，对不同气候条件（半湿润温暖和湿润温暖气候）、季节变化（旱季和雨季）以及每小时变化（3:00至18:00）的光合性能，这些变化可能在早期生长阶段（两年生植株）产生胁迫。与IAN 873相比，60%的哥伦比亚基因型在水分可利用性较低的条件下（旱季、半湿润温暖地区以及9:00至15:00之间）光合性能受到轻微影响，IAN 873在光合速率方面受到中度影响，但其水分保持策略受到强烈影响。在水分限制更大的条件下，ECC 90、ECC 83和ECC 73基因型具有最佳光合性能，基于叶片水势，ECC 35和ECC 64具有较高的水分状况，光合性能中等。在哥伦比亚亚马逊地区未来气候变化的情况下，这种种质在橡胶树育种计划中有很高的选择潜力。
