Foliar Nutrient Uptake (Translocation) in HLB Affected Leaves
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1 Foliar Nutrient Uptake (Translocation) in HLB Affected Leaves Ron Brlansky, Ai-vy Riniker and Carmen Bierman University of Florida Citrus Research and Education Center
2 Why does this HLB Tree Look Good?
3 Samples Taken Locations: Foliar Nutrient treatments at Orange Hammock Grove, Felda, Bob Rouse- SWREC, Immokalee and CREC plots at Lake Placid Sampling dates: September 2010, February 2011, July 2011 Types of samples: leaf petioles, midribs, fruit bearing stems, and fruit columellas Fixed, embedded, sectioned and stained for light microscopy and for phloem translocation studies Photographs taken, analyzed and compared
4 Orange Hammock- All trees treated with Nutrient Cocktail
5 HLB Petioles Val/Swg-Treated No Symptoms
6 HLB Petioles Val/Car-Treated With Symptoms
7 HLB Affected - Untreated
8 HLB Petioles Young Val/Swg-Treated Flush No Symptoms PCR +
9 HLB Petioles Young Val/Swg-Treated Minor Symptoms
10 HLB Petioles Val/Swg-Treated With Symptoms
11 HLB Stems Val/Swg-Treated With Symptoms
12 HLB Infected- Untreated
13 Treated
14 SWREC: Untreated,Row 6, Tree 18
15 HLB Petioles Untreated B.R.-2010
16 HLB Stems Untreated B.R.-2010
17 HLB Petioles Treated B.R.-2010
18 HLB Stems Treated B.R.-2010
19 Is the Phloem Functional? Methods have been used with other plants studying phloem uptake or translocation (TL) In collaborative work with Fan Jing we began using a fluorescent dye for phloem studies in HLB affected and healthy citrus in greenhouse trees We have since used it to see what is happening with nutrient treatments at these locations listed previously
20 Source-Sink Functionally a plant can be divided into source and sink Sources are parts where net fixation of carbon dioxide occurs Sinks are sites where assimilates are stored or used Allocation of assimilates between plant parts occurs via transport in the phloem.
21 Source-Sink of Citrus Herbaceous crop plants accumulate these materials in source leaves during the photoperiod and evacuate them at night Citrus leaves have a system that is different Annual changes occur in carbohydrate levels & represent a combination of developmental and seasonal trends with the demands exerted by developing leaves and shoots and reproductive (flowers and fruits) sinks
22 Failure of Source/Sink Plants may have adverse environmental conditions (stress) and diseases that inhibit this source to sink process HLB is a phloem disease with infection by Ca. Liberibacter asiaticus and the production of collasped necrotic phloem that is not functional
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26 BR6: Row 4 Tree 15 (treated)
27 BR3: Row 6, Tree 18 (untreated)
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32 BR1:Row 3, Tree 18
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35 BR5: Row 3, Tree 21
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38 Orange Hammock
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45 Can We Measure the Amount of Dye Taken Up? Yes with microtiter plate assays that measure the amount of dye in the spots and just subtract that amount from the amount of dye applied to get the amount of dye translocated
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48 Comparison of Healthy and HLB Affected Samples Averages (collected ) Healthy Leaves 247 ug/ml HLB Leaves 83 ug/ml
49 Comparison of Nutrient Treated and Untreated Healthy and HLB Affected Samples Averages (collected ) Healthy Water Sprayed Leaves 240 ug/ml Healthy Nutrient Sprayed Leaves 332 ug/ml HLB Water Sprayed Leaves 53 ug/ml HLB Nutrient Sprayed Leaves 90 ug/ml
50 Comparison of Nutrient Treated and Untreated Healthy and HLB Affected Samples Averages (collected ) Healthy Water Sprayed Leaves 238 ug/ml Healthy Nutrient Sprayed Leaves 276 ug/ml HLB Water Sprayed Leaves 74 ug/ml HLB Nutrient Sprayed Leaves 80 ug/ml
51 Comparison of Nutrient Treated and Untreated Healthy and HLB Affected Samples Averages (collected ) Healthy Water Sprayed Leaves 395 ug/ml Healthy Nutrient Sprayed Leaves 477 ug/ml HLB Water Sprayed Leaves 132 ug/ml HLB Nutrient Sprayed Leaves 201 ug/ml
52 Comparison of Nutrient Treated and Untreated Healthy and HLB Affected Samples Averages (collected ) Healthy Water Sprayed Leaves 279 ug/ml Healthy Nutrient Sprayed Leaves 373 ug/ml HLB Water Sprayed Leaves 113 ug/ml HLB Nutrient Sprayed Leaves 198 ug/ml
53 Comparison of HLB Nutrient Treated with Untreated Healthy (Orange Hammock Jan 2013) Sample Translocated Dye Healthy Greenhouse Leaves 330 ug/ml HLB Nutrient Sprayed Fruit Leaves 344 ug/ml HLB Sprayed Mature Leaves 328 ug/ml HLB Nutrient Sprayed Young Leaves 277 ug/ml HLB average 316 ug/ml
54 So What s Happening? Cytological results of experiments conducted by Rouse at the SWREC show improvement of HLB trees treated with nutrients e.g. new phloem with more open elements as compared to untreated HLB affected trees Results from Orange Hammock grove show similar results (HLB PCR positive treated trees) Fluorescent uptake tests show functional phloem in treated trees vs untreated but not as good as healthy unaffected trees
55 Fluorescent assay works well however there is some seasonal variability in how much dye moves Annual changes occur in carbohydrate levels & represent a combination of developmental and seasonal trends exerted by the tree Re-establishing the source to sink connection by producing new phloem for photosynthetic products to move to sinks (fruit and new flushes and maybe roots) Phloem may still degrade and be blocked since the tree is still diseased
56 Currently working on a larger database for these results and an in-field on-tree assessment of the phloem translocation in treated trees
57 Funding for the project came from the Citrus Research and Development Foundation Current funding for this project ends June 30
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