Premium
Temperature effects on partitioning of 14 C assimilates in tall fescue ( Festuca arundinacea Schreb.)
Author(s) -
PRUD'HOMME M. P.,
GASTAL F.,
BELANGER G.,
BOUCAUD J.
Publication year - 1993
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1993.tb03733.x
Subject(s) - fructan , festuca arundinacea , sucrose , chemistry , carbohydrate , botany , poaceae , biology , agronomy , horticulture , food science , biochemistry
SUMMARY Fructan synthesis and carbon partitioning to roots of tall fescue (Festuca arundinacea Schreb.) were studied with a 14 C‐labelling technique at three growth temperatures: 24/17 °C, 16/10 °C and 8/5 °C (day/night). Plants at 16/10 °C and 8/5 °C had an increased proportion of assimilates allocated to the root system; 10 d after exposure at 14 CO 2 , the relative carbon partitioning to the roots averaged 12.5, 16.3 and 26.8 % respectively, at 24/17 °C, 16/10 °C and 8/5 °C. Chilling temperatures induced an increase in the amounts of sucrose and fructans in leaves. Interestingly, a similar pattern occurred in roots where low‐DP fructans (DP < 8) are the predominant non‐structural carbohydrate constituent. Incorporation of 14 CO into root oligo‐ and polysaccharides showed a progressive movement of radioactivity from sucrose to fructans. These results show that the roots can serve as a carbon storage organ and that fructan synthesis depends on sucrose supply. The function of the fructan stored in the roots is unknown.