应用同位素示踪技术对苎麻某些生理特性的探讨

1963～1965,1985和1988年前后5年,应用~(32)P和~(14)C同位素示踪技术,在大田和盆栽条件下,研究了8个苎麻品种的某些生理特性,结果如下:a.冬季苎麻地上部虽然冻死,但其根系仍具有吸收、运输、贮藏矿质养料等功能,其吸收速率随着地温的变化而变化。b.比较三种不同地下茎根系的吸收能力,跑马根约为龙头根的2倍,而扁担根为龙头根的1.5倍左右。c.1983年三麻封行期,有效株或无效株所吸收的磷素转移到无效株的百分率较高,随着植株趋向成熟,其转移百分率也随之减少。d.在1985年两季麻的不同生长期,高产品种沅江“黄壳早”的根系生理活性高于低产品种“拱县园麻”,两个品种磷素含量的差异与其根系生理活性类似,且两者均呈正相关。e.不同品种的光合速率和标记叶片~14C同化物运至其它器官和麻皮的百分比,均以C-20最高,C-2-14和CK-2次之,CK-1最低。

A STUDY ON SOME RAMIE PHYSIOLOGY CHARACTERS WITH ~(32)P AND ~(14)C ISOTOPIC TRACE TECHNIQUE

The study was undertaken on eight ramie varieties in both field and potculture conditions with ~(32)P and ~(14)C isotopic trace technigue from 1963 to1965 and from 1985 to 1988. It shows that a) While the aerial parts of ramieare frozen to death in winter, their roots still have the functions of absorp-tion, transportation and storage, etc. The absorbing rate of the roots varieswith soil temperature; b) The Paoma roots are about 2 times as powerful asthe Longtou roots, while Bianden roots about 1.5 times as far as absorptionis concerned; c)The translatory percentage of ~(32)P absorbed by availableand/or non-available plants into the non-available plants gets higher at theclosing-row stage of the third crop. As plants get to mature, the percentagetends to decrease; d)The high yield variety Huangkezao has higher rootactivities than the low yield variety Yuanma. The difference of phos-phorus contents between two varietes is similar to their root activities anda positive correlation between root activity and phosphorus content is foundin both varieties; e) C-20 is the highest, then comes C-2-14, CK-2 and CK-1in sequence for all varieties as far as the photosynthetic rate and the per-centage of ~(14)C-assimilation, which is transported from the labelling-leaf toother organs and skin, are concerned.