梧桐树资源中的气体交换

Q3 Agricultural and Biological Sciences

Comunicata Scientiae Pub Date : 2023-09-30 DOI:10.14295/cs.v14.4154

Sérgio Luiz Rodrigues Donato, Alessandro de Magalhães Arantes, Beatriz Lima Barros, Joel da Silva de Deus, Ednei de Souza Pires

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引用次数: 0

摘要

本工作的目的是评价乌布树的气体交换。采用完全随机设计的5 × 7 × 2分割图实验(5份文献- BRS-68、EPAMIG-05、BGU-61、BGU-75和BGU-50 × 7个评价日期× 2个阅读时间-上午8点和下午2点)，重复3次。与BGU 61相比，BRS-68和EPAMIG 05叶片温度较低，有利于提高净光合速率、水分利用效率和瞬时羧化效率。在高蒸汽压亏缺下，乌布树通过降低气孔导度来调节蒸腾，尽管树木增加蒸腾是一种抵御热胁迫的防御策略，即使气孔导度降低。高温限制了瞬时羧化效率、光合速率和叶片上光合作用与辐射的比值。蒸腾与气孔导度成正比，内在水分利用效率与内部CO2浓度成反比。

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Gas exchange in umbu tree accessions

The objective of this work was to evaluate gas exchanges in umbu tree accessions. A 5 × 7 × 2 split-split plot experiment was carried out in a completely randomized design (five accessions – BRS-68, EPAMIG-05, BGU-61, BGU-75, and BGU-50 × seven evaluation dates × two reading times – 8 a.m. and 2 p.m.) with three repetitions. The lower leaf temperatures recorded in BRS-68 and EPAMIG 05 accessions favor higher net photosynthetic rates, water use efficiency and instantaneous carboxylation efficiency compared to BGU 61 accession. Umbu tree regulates transpiration by reducing stomatal conductance under high vapor pressure deficit, although the tree increases transpiration as a defense strategy against heat stress, even with a reduction in stomatal conductance. High temperatures limit instantaneous carboxylation efficiency, photosynthetic rate, and the ratio of photosynthesis to radiation incident on the leaf. Transpiration varies directly with stomatal conductance, while intrinsic water use efficiency varies inversely with internal CO2 concentration.

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来源期刊

Comunicata Scientiae Agricultural and Biological Sciences-Agricultural and Biological Sciences (all)

CiteScore

0.90

自引率

0.00%

发文量

期刊介绍： The Comunicata Scientiae journal edited by Campus “Profa Cinobelina Elvas” of Federal University of Piauí (Brazil) publishes original articles, scientific notes and review articles (when invited by the editorial board), which present significant importance for Agrarian and Environmental Sciences in Portuguese, Spanish and preferentially, in English.