15 N partitioning in tomato: vascular constraints versus tissue demand

Functional Plant Biology : FPB
Amy E ZanneColin M Orians

Abstract

Allocation of root-derived resources is influenced by tissue demand; however, vascular pathways mediate resource flow from roots to shoots. In vascularly constrained plants (i.e. sectored plants), effects of vascular connections likely limit homogenous resource delivery, especially when environmental resource distribution is patchy. Here, we quantify relative roles of vascular connections, demands by different leaves (i.e. by leaf age and size), and molecule size of transported N compounds (effective sectoriality: nitrate v. ammonium) on allocation of 15N in the sectored tomato (Solanum lycopersicum L.). Vascular connections were the strongest predictor of both accumulation (amount per leaf; P<0.0001) and δ (estimate of concentration; P<0.0001) 15N values in mature leaves, but young expanding leaves did not show such dramatically sectored uptake (accumulation: P=0.0685; δ: P=0.0455), suggesting that sectoriality is less strong in young expanding tissue, especially in the youngest leaf. In patchy environments sectoriality, then, should have large consequences for the ability of a plant to allocate resources in mature tissue; however, young leaves do not appear to experience such strong vascular constraints when building new tissue.

References

Feb 13, 2001·Science·M A ZwienieckiN M Michele Holbrook
Mar 26, 2002·Journal of Experimental Botany·J K SchjoerringM Mattsson
Apr 24, 2003·Journal of Experimental Botany·Maciej A ZwienieckiN Michele Holbrook
Mar 1, 2004·American Journal of Botany·John S Sperry, Uwe G Hacke
Nov 1, 2004·Functional Plant Biology : FPB·Marta S LopesJosé L Araus
Jun 1, 2002·Functional Plant Biology : FPB·Wolfgang WanekMarianne Popp

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Citations

Sep 14, 2010·The New Phytologist·Roberto Salguero-Gómez, Brenda B Casper
Jan 23, 2009·Bulletin of Entomological Research·J A BennettS L VanLaerhoven
Jan 22, 2019·The New Phytologist·Natalie ChristianKeith Clay
Nov 1, 2011·Functional Plant Biology : FPB·Alexandra M Thorn, Colin M Orians
Mar 1, 2012·Functional Plant Biology : FPB·Teresa S DavidNadezhda Nadezhdina
Jan 1, 2009·Functional Plant Biology : FPB·Zongjian Yang, David J Midmore

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