Daily embolism and refilling of root xylem vessels in three dicotyledonous crop plants

被引：30

作者：

Buchard, C ^{[1
]}

McCully, M ^{[1
]}

Canny, M ^{[1
]}

机构：

[1] Carleton Univ, Dept Biol, Ottawa, ON K1S 5B6, Canada

来源：

AGRONOMIE | 1999年 / 19卷 / 02期

关键词：

diurnal root embolism; Fagopyrum esculentum; Glycine max; Helianthus annuus; refilling-vessels;

D O I：

10.1051/agro:19990202

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Embolisms were observed directly in the xylem vessels of roots of field-grown buckwheat (Fagopyrum esculentum Moench.), sunflower (Helianthus annuus L.) and soybean (Glycine max (L.) Men.) by cryo-microscopy. No vessels were embolized at dawn, but in all three species some embolisms had formed by 0900 hours, The percentage of vessels embolized reached 40-60 % between 0900 and 1200 hours, then declined to near 0 % by sunset. The plants were still transpiring when embolisms were refilling. There was no correlation of percentage embolism with rate of transpiration, but a small positive correlation with balance pressure. Daily embolism and refilling of root vessels were observed previously in maize, and also appear to be a normal process in dicotyledonous crop plants. ((C) Inra/Elsevier, Paris.).

引用

页码：97 / 106

页数：10

共 18 条

[1] CAVITATION AND RESISTANCE TO WATER-FLOW IN PLANT ROOTS [J].