The right koa for you…..

1. Charles H. Michler Director, Tropical Hardwood Tree Improvement and Regeneration Center The right koa for you…..

2. Acknowledgments • Paul Scowcroft • JB Friday • Christian Giardina • Nick Koch • Mike Robinson • Travis Idol • Nick Dudley • Katie Friday • James Brewbaker • Creighton Litton • Bob Masuda • Aileen Yeh • Cheyenne Perry • Tom Baribault • Michael Constantinides

3. Different kinds of koa • Canoe logs • Elite timber trees • Ecological habitat • Genetic diversity • Adapted to different climates (dry, wet, cold, frost, etc.) • Wilt resistant • Insect resistant

4. Population Genetics Taking advantage of genetic variation that exists within a population or between populations to produce trees or stands with desired suite of traits Within Between Productive plantations/natural forests occur when you: Match the genetics of the desirable trees with sites where they are well-adapted and then apply good silviculture

5. Population Considerations • Tend to not want to move populations greater than 1000 ft. in elevation, but this needs to be tested in the case of koa. • Biggest problems occur when you move material from a higher to lower elevation • Don’t move populations from areas that have little environmental variation (rainfall, temperature, etc.) to sites that have much variation. • Tetraploidy makes it more difficult to predict heritability, but it can be done. • Long term retention of seed bank can prevent loss of genetic variation due to high-grading (continually harvest the best trees) and alternate land use.

6. Sources of Population Variation • Mutations • Unique trait appears such as nut shape, branch angle, or figured wood • (Natural) Selection of the fittest • Loss of trees that cannot compete • Gene flow between populations • We take advantage of this in seed orchards by using parents from different populations

7. Needs for Genetic Improvement • Straightness and lack of forking • Volume increase • Wood density??? • Crown architecture??? • Insect tolerance (Acacia psyllid) • Might be accomplished through management • Vascular wilt tolerance (Koa wilt) • Often accomplished through resistance of a vector if the disease is mediated in this manner • Other traits??

8. Expectations from Genetic Improvement • 2-4%/year gain (20-25% per selection cycle) • Much higher through genomic technologies (if funds are available) • Highly heritable • Straightness • Branch angle • Volume • Pest resistance (can be)

9. Possible limitations to consider • Type of pollinators and weight of pollen (short wind driven distance) could limit genetic diversity between separated populations • On the mainland, pollinators in many forested landscapes are becoming or have become absent • Seed orchard design still unclear for insect pollinated species (we augment pollinators when they are limiting)

10. Uses of Vegetative Propagation(grafting, rooted cuttings, tissue culture, air layering, etc.) • Preserve important trees • Multiplication of important trees for further testing • Deploying elite clones to capture maximum genetic gain

12. Nick Dudley, HARC Development of Wilt resistant koa for Hawai΄i • Moderate to high mortality in mid to low elevations • Screening families at the seedling stage • Developing seed orchard lots to examine durability of field resistance • Developing resistant populations across most islands and growing zones • Using tissue culture to bank resistant lines

13. Development and selection of high quality koa using McIntire-Stennis funds at UH-M(Turano, Brewbaker, Friday, Idol, and DeFrank) • Evaluate koa progeny for color and figure • Develop methods for cloning koa/propagate superior clones • Plant clonal orchards at various locations • Genotype high quality accessions • Determine wood quality of young koa trees • Determine ultrastructure of figured wood

14. Identifying the Prime Timber Trees KS trees that will be thinned into a seed orchard

15. Harc A site After data analysis and thinning (Forest Solutions)………Ready for progeny testing of best families on DHHL land Will analyze wood quality differences among families and also the genetics of seeds in a single pod (one pollen grain may fertilize all eggs in a pod) Nick Dudley/Aileen Yeh initiated planting and Oriana Krauss/Keith Woeste measured/analyzed

16. Matching koa seedlings to the correct elevation Low frost tolerance Moderate frost tolerance High frost tolerance

17. Objectives: 1) Estimate variation in genetics between koa populations in various regions of the Big Island, 2) Evaluate genes vital for survival at varied latitudes in a changing climate, 3) Use NexGen sequencing to identify and characterize genes responsible for critical variations in koa populations. SITE LOCATIONS Kaua’i Moloka’i Ni’ihau O’ahu Waimea Maui Kohala Lana’i B Hawai’i (Big Island) Kaho’olawe Mauna Kea H Hilo P Hualalai M Mauna Loa Kona Kilauea Fig. 1. Site Identification and Elevation. B= Bird Corridor (>7,000 ft ) P= KipukaPu’U (6700–6800 ft) H= Hark A (6600–6700 ft) M= Nine Mile (2200–2400 ft) Volcanoes National Park

18. Which genes involved in survival allow certain Acacia koa to survive at higher altitudes while others perish? Koa tree survival at varied elevations. Seedpods are usually most viable within 1000 ft of their mother tree. Upper Range Limit Example: Seedling adaptability range Without koa trees for nesting, endangered birds are pushed towards extinction Not adapted = > 1,000 ft north M Growth range = 1,000 ft Not adapted = > 1,000 ft south *Koa can grow at lower elevations however, wilt disease has decimated remaining trees

19. Next Generation Sequencing (NGS) Compilation and analysis of NGS datasets. RNA extracted from koa phyllodes was used for NGS to aid in sequence and gene identification. EXAMPLE DATASET Phyllode Bipinnate leaflets

20. Which genes are involved in or responsible for the formation of figure in Acacia koatrees ? Why are some “neighbor” trees unexceptional? Elevation Precipitation Insects Soil content Herbivores Sunlight Figure formation in wood. Koa growth is made exceedingly complicated by the differences seen in wood from the sawn trees grown under identical conditions. Low Quality Figure Harvest High Quality Figure $4 – $8 bdft $100 – $150 bdft A A A B B B Growth Conditions

21. Identify genetic variation between various koa populations • Evaluate genes vital for survival in a changing climate • Assemble the first koa genome sequence available for public use • Uncover data useful in koa forest restoration for support of endangered native bird species Koa trees also provide habitat for birds species found only in Hawai’i 'Akiapola'au (Hemignathusmunroi) 'I'iwi (Vestiariacoccinea)

22. Scarification and removal of invasive grasses leads to habitat restoration . Decreased grass cover improves growth Invasive grasses prohibit growth James Leary et al.

23. Improved Wild tree Proposed Planting Design with Focus on Crop Trees

24. Lessons Learned: Plantation prescriptions • Increase stand density—could be large increase for Koa • Mixed tropical hardwood species • Silvicultural trials looking at competition • Start planting with focus on end result • Invest in crop trees or invest in the ecology • Start with most appropriate seed---the right provenance

25. What’s needed to be successful • Long term commitment (Foundation) • Knowledge of basic biology of the species (much to learn) • Flowering, seed biology, physiology • Operational and developmental (research) components • Land for testing • Funds for staff, equipment, infrastructure, and supplies • Maintained focus (constant worthy suggestions)