Function of node unit in photosynthate distribution to root in higher plants

Title:

Function of node unit in photosynthate distribution to root in higher plants

Creator:

Osaki, M., Shinano, T., Yamada, M., and Yamada, S.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:e957cde1-83c2-40b7-9007-275175261bbf
uuid:e957cde1-83c2-40b7-9007-275175261bbf
issn:0300-3604
doi:10.1023/B:PHOT.0000040580.22939.55

Subject:

Glycine, Helianthus, Lycopersicon, node unit, photosynthate translocation, phytomer, phyllotaxy, phyton, source-sink relationship, and Triticum

Type:

model:article and TEXT

Format:

bez média and svazek

Description:

Leaf-root interaction is a critical factor for plant growth during maturation and activity of roots is maintained by a sufficient supply of photosynthates. To explain photosynthate distribution among organs in field crops, the node unit hypothesis is proposed. One node unit consists of a leaf and an upper adventitous root, as well as the axillary organs and the lower adventitious root, which is adjacent to one node. Using 14C as tracer, the carbon distribution system has been clarified using spring wheat, soybean, tomato, and potato. The interrelationship among organs from the strongest to the weakest is in the following order: (1) within the node unit > (2) between the node unit in the same or adjacent phyllotaxy > (3) in the main root or apical organs, which are adjacent to the node unit. Within the node unit, 14C assimilated in the leaf on the main stem tended to distribute to axillary organs in the same node unit. The 14C assimilated in the leaf of axillary organs tended to distribute within the axillary organs, including adventitious roots in the axillary organ and then translocated to the leaf on the main leaf of the same node unit. In different organs of the node unit in the same or adjacent phyllotaxy, 14C assimilated in the leaf on the main stem was also distributed to the organs (node unit) belonging to the same phyllotaxy in dicotyledons, while in monocotyledons, the effect of phyllotaxy on 14C distribution was not clear. Among roots/apical organs and node unit, 14C assimilated in the upper node unit was distributed to apical organs and 14C assimilated in the lower node unit was distributed to roots. Thus the node unit hypothesis of photosynthate distribution among organs is very important for understanding the high productivity of field crops. and M. Osaki ... [et al.].

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

123-131

Source:

Photosynthetica | 2004 Volume:42 | Number:1

Harvested from:

CDK

Metadata only:

false