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首页> 外文期刊>Acta Physiologiae Plantarum >Optical properties and the content of photosynthetic pigments in the stems and leaves of the apple-tree
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Optical properties and the content of photosynthetic pigments in the stems and leaves of the apple-tree

机译：苹果树茎叶的光学性质和光合色素含量

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摘要

Optical properties and changes in the content of photosynthetic pigments (chlorophyll and total carotenoids) were investigated in the bark and leaves of the apple-tree during a year.Optical properties of stems change with their age. Light reflectance of current year stems equalled 14.2 %, while the one for 3-year-old stems decreased to 10.2 %, absorption for the current year stems equalled 55.5 % and increased up to 66.4 % for 3-year-old ones. Light transmittance for the cork Of Current year stems equalled 30.2 %, and decreased with the age of stems reaching 23.4 % for the 3-year-old ones. The cork transinitted less than 5 % of light of 400 nm, but the transmittance increased with the increase in the wavelength LIP to 55 % at 700 nm. The reflectance of light by the leaf equalled 6.9 %, absorption 89.7 %, and transmittance 3.4 %.In August the highest amount Of chlorophyll pigments (6.2 mg.dm(-2)) and carotenoids (1.63 mg.dm(-2)) was detected in the leaves of the apple-tree, however, the ratio of chl a/b reached the highest value 4.12 ill June.For the bark of apple-tree stems the content of chlorophyll pigments increased since spring and reached the maximum content of about 2.8 mg(chl)-dm(-2) for 1-3-year-old stems in the summer months, while for the current year steins in October. The ratio chl a/b was at the same level, about 2.2 during the whole year. The content of carotenoids was lower in stems than in leaves and was at the similar level during the year, however, it increased with the a,,e of stems. Minor changes in the optical properties and the content of photosynthetic pigments occurring with the age of stems may be due to the low increment in cork thickness in the studied age groups of plants.Minor changes in the optical properties and the content of photosynthetic pigments occurring with the age of stems may be due to the low increment in cork thickness in the studied age groups of plants.
机译：研究一年中苹果树的树皮和叶子的光学特性和光合色素（叶绿素和总类胡萝卜素）含量的变化。茎的光学特性随年龄而变化。当年茎的光反射率为14.2％，而3岁茎的光反射率下降至10.2％，当年茎的吸收率为55.5％，而3岁茎的吸收率高达66.4％。当年的软木塞的透光率等于30.2％，而3岁的软木塞的透光率随着年龄的增长而降低，达到23.4％。软木塞发出的光不足400 nm的5％，但透射率随波长LIP的增加而增加，在700 nm时达到55％。叶的光反射率为6.9％，吸收率为89.7％，透射率为3.4％.8月，叶绿素色素（6.2 mg.dm（-2））和类胡萝卜素（1.63 mg.dm（-2））含量最高。在苹果树的叶子中检测到了chl a / b的比值，直到6月才达到最高值4.12。对于苹果树的树皮，自春季以来叶绿素色素的含量增加，并达到最大。夏季月份，1-3岁的茎约2.8 mg（chl）-dm（-2），而今年10月的茎中约含2.8 mg（chl）-dm（-2）。比率chl a / b处于相同水平，全年约为2.2。一年中，茎中类胡萝卜素的含量低于叶片中的含量，并且在一年中处于类似水平，但是随着茎中a，e的增加。随着年龄的增长，光学特性和光合色素含量的细微变化可能是由于所研究的植物年龄组中软木厚度的增加较小所致。茎的年龄可能是由于在研究的植物年龄组中软木厚度的增加幅度较小。

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