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Abstract Detail

Physiological Section

Brodersen, Craig  [1], Narciso, Cody [2], Reed , Mary [3], Etxeberria, Ed [4].

Seasonal production of phloem tissue in HLB-affected trees.

A hallmark symptom of citrus Huanglongbing (a.k.a. HLB or Citrus Greening) is the  progressive degeneration of the phloem tissue. Despite the apparent partial to total collapse of phloem elements in HLB-affected leaves and limbs, new vegetative growth continues to develop for several seasons. In fact, HLB-affected branches with evident HLB symptoms and seemingly obstructed phloem are capable of fruit production for some time. These observations suggest that, for undetermined periods of time, photoassimilate transport takes place in the older supporting and newly developed flush tissue. Here, we examined the phloem tissue of HLB-affected stems and of new flush on HLB-affected stems for several seasons. Our observations indicate that seasonal waves of cambial activity and phloem production, concurrent with vegetative flushes, are capable of temporarily alleviating phloem transport blockage caused by HLB-affected phloem tissue.

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1 - University of Florida, Horticultiral Sciences, CREC
2 - Notre Dame
3 - University of Florida
4 - University Of Florida, 700 Experiment Station Road, Lake Alfred, FL, 33850, USA

phloem production.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Eyrie/Boise Centre
Date: Monday, July 28th, 2014
Time: 5:30 PM
Number: PPS002
Abstract ID:190
Candidate for Awards:None

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