Relationship between photosynthetic rate, water use and leaf structure in desert annual and perennial forbs differing in their growth
Relationship between photosynthetic rate, water use and leaf structure in desert annual and perennial forbs differing in their growth
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DOI：
10.1007/s11099-018-0810-z
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发表时间：
2018-12-01
期刊：
影响因子：
2.7
通讯作者：
Ravetta, D. A.
中科院分区：
文献类型：
--
作者：
Gonzalez-Paleo, L.;Ravetta, D. A.
比叶面积(SLA)是筛选植物生态性能和生产力的关键指标；然而，当比较具有不同生活史的多个物种时，SLA与光合作用之间的关系并不总是可扩展到生长。我们研究了一年生和多年生商陆属植物的叶片解剖结构，并将其与光合作用和水分损失联系起来。与多年生小叶商陆相比，一年生小叶商陆具有更高的SLA、更薄的叶片和更低的保护组织投入。狭叶商陆(一年生)和松树(多年生)表现为中间值。与一年生植物相比，两种多年生植物都有较厚的栅栏和较高的光合作用。多年生植物较大的叶脉应该允许叶肉获得较高的水分利用率。较厚的栅栏应该决定了对水流的高阻力，并有助于解释其高水分利用效率。这些叶的功能反映了在干旱环境的环境限制下高效利用资源的长寿叶的构造。
Specific leaf area (SLA) is a key trait to screen plants for ecological performance and productivity; however, the relationship between SLA and photosynthesis is not always up-scalable to growth when comparing multiple species with different life cycles. We explored leaf anatomy in annual and perennial species of Physaria, and related it to photosynthesis and water loss. The annual Physaria gracilis had higher SLA, thinner leaves, and lower investment in protective tissues, than perennial P. mendocina. Physaria angustifolia (annual), and P. pinetorum (perennial) showed intermediate values. Both perennials had a thicker palisade and high photosynthesis, relative to annuals. The larger leaf veins of perennials should allow high water availability to the mesophyll. The thicker palisade should determine high resistance to water flow and help explain their high water-use efficiency. These leaf functions reflect the construction of long-lived leaves that efficiently use resources under environmental limitations of arid environments.