Photosynthetic activities of vegetative and fruiting tissues of tomato
Photosynthetic activities of vegetative and fruiting tissues of tomato
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DOI：
10.1093/jexbot/49.324.1173
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发表时间：
1998-07-01
影响因子：
6.9
通讯作者：
Davies, WJ
中科院分区：
文献类型：
--
作者：
Hetherington, SE;Smillie, RM;Davies, WJ
番茄植株不同含叶绿素部位的光合活性。cv, Saporo)用叶绿素荧光技术进行鉴定。研究中选择的桁架包含接近成熟的绿色果实，并对桁架的花梗、花梗、花萼和果实进行了测量。这些组织的活性与相邻复叶的活性进行了比较，复叶被认为是果实光合同化物的主要供应者。所有组织都表现出较高的内在光系统II效率，测量为F-v/F-m，在黑暗适应组织中（范围为0.77 - 0.82），最大光合电子转移活性在110至330 pmol m(-2)s（-1）之间变化。随着光子通量密度的增加，组织的实际光合产量、电子传递速率和组织的光化学猝灭系数（q(p)）依次递减，顺序为：上叶、下叶、叶柄、叶柄、花梗、花萼、果实。随着光子通量密度的增加，吸收的光子能量转向非光化学途径的速度呈相反的顺序。在高光子通量密度下开始的F-o猝灭表明，所有组织都包含一种以热量形式耗散多余能量的调节机制。由此可见，番茄非叶绿色组织具有较强的光合活性，对植株生长具有重要的促进作用。在光子通量密度为185 μ mol m(-2) s（-1）时，29%的光合电子传递活性位于叶面以外的组织中，果实占15%。
Photosynthetic activities of different chlorophyll-containing parts of tomato plants (Lycopersicon esculentum Mill. cv, Saporo) were assessed using chlorophyll fluorescence techniques. Trusses selected for study contained near mature, green fruit and measurements were carried out on the truss peduncle, pedicels, calyces, and fruit. Activities of these tissues were compared with those of adjacent compound leaves considered to be the primary suppliers of photosynthetic assimilates to fruit. All tissues showed high intrinsic efficiencies of photosystem II, measured as F-v/F-m,, in dark-adapted tissue (range 0,77-0,82), Maximal photosynthetic electron transfer activities varied from 110 to 330 pmol m(-2)s(-1). With increasing photon flux density there was a gradation of tissue activity with actual photosynthetic yields, electron transport rates and photochemical quenching coefficients (q(p)) of tissues decreasing in the order: upper leaf lamina, lower leaf lamina, leaf petiole, truss peduncle, pedicel, calyx, and fruit. The reverse order was found for the rapidity at which absorbed photon energy was diverted to non-photochemical pathways as photon flux density was increased. The onset of F-o quenching at high photon flux densities suggested that all tissues contained a regulated mechanism for dissipating excess energy as heat. It was concluded that the non-leaf green tissues of tomato are quite active photosynthetically and therefore potentially contribute significantly to plant growth. At a photon flux density of 185 mu mol m(-2) s(-1), 29% of photosynthetic electron transport activity on a surface area basis was located in tissues other than leaf laminae, with fruit accounting for 15%.