Root Growth Characteristics of Peanut Genotypes

落花生品種根之生長特性

黃明得(Ming-Teh huang) ； Darold. L Ketring

《中華農業研究》 36卷1期 (1987/03) Pp. 41-52

https://doi.org/10.29951/JARC.198703.0004

摘要

根之生長特性被認爲與作物之耐旱性有關。本試驗乃分別于1983及1984年于溫室中，探討落花生型及品種間根長、主根生長速率、根數、根長密度之差異，以及主根長度與地上部乾重之相關。此外，也探討根容積、根與地上部乾重，及根與地上部重量比之差異及其彼此聞之相關。由結果知，品種問在主根生長速率、根數及在土表下30公分之根數有顯著之差異。落花生主根生長速率最高的時期在播後21?28天間，其中Virginia型之主根長度及生長速率皆大于Spanish型。主根長度與地上部乾重則僅在試驗二中有正相關關係。在根容積方面，Virginia型之地上部及全株乾重較大，但根與地上部重量比則較Spanish型小。根容積與根、地上部及全株重等皆呈正相關，根重也與地上部及全株重呈正相關關係。然而，根容積及根重與根／地上部重量比間之相關，並不顯著。

並列摘要

To evaluate the potential of peanut root growth characteristics such as taproot growth rate at different periods of growth, taproot length, root number, root length density at different depths, and the relationship between taproot length end shoot dry weight were examined under greenhouse conditions during 1983 and 1984. Saparate studies on root volume, root and shoot dry weights, root/shoot ratio, and their interrelationship were also conducted. Data obtained showed that peanut genotypes differed in taproot growth rate, root number, and length density in the first 33 cm of soil profile. However, perhaps doe to the different times during the year when the tests were conducted, several characteristics such as root length density, number of roots at different depths, and correlation between taproot length and shoot dry weight varied between tests. In root length studies, the fastest taproot elongation was found between 21 to 28 days after planting end virginia type peanuts had longer taproot and faster root growth rate than spanish types. The corre1atioo between taproot length and shoot dry weight was significant in one test held in late winter. In root volume studies, no significant differences in root volume and root dry weight were found between types. Virginia type peanuts tended to have heavier shoot and total dry weight, but lower root/shoot ratios than spanish type. Significant positive linear correlations were found between root volume and shoot, root, and total dry weights. Also, root dry weight was positively associated with shoot, and total dry weight. Root volume and root dry weight did not show linear relationship with the root/shoot ratio in this study.