In vivo pollen tube growth of pecan [Carya illinoinensis (Wangenh.) K. Koch] was estimated to be ≈ 150 μm·hour-1 from 3 to 8 hours postpollination. Pollen tubes averaged 47, 194, 405, and 946 μm after 2, 3, 4, and 8 hours postpollination, respectively. Pollen tube growth was strongly influenced by temperature, and in vitro studies demonstrated pollen germination and tube growth were optimal at 27C for `Cape Fear' pecan. In in vivo studies, tubes of cross-pollen did not grow significantly faster than tubes of self-pollen. Pollen tubes of water hickory [C. aquatica (Michx. f.) Nutt.] grew significantly faster than those of C. illinoinensis. Bitternut [C. cordiformis (Wangenh.) K. Koch] and mockernut hickory (C. tomentosa Nutt.) pollen tubes grew significantly slower on pecan stigmas than did pecan pollen. Pollen arriving first on the stigma has a decided advantage for fertilization success of pecan. The fertilization success rate of pecan pollen arriving 24 hours after first pollen arrival was <3%.
A microsatellite-enriched library was developed from `Halbert', a native pecan [Carya illinoinensis (Wangenh.) K. Koch] selection from Coleman County, Texas. A genomic library enriched for simple sequence repeats (SSR) containing 6144 clones was archived in 384 well plates for screening. In total, 439 clones were identified after Southern hybridization using di- and tri-nucleotide repeats as probes. In total, 125 positive clones were sequenced and primers were designed for 24 repeats. The SSR markers chosen for analysis include di-(CT and GA) and tri-nucleotide repeats (CTT, GAA and GAT). Of the 24 primer pairs tested, 19 successfully amplified microsatellites from `Halbert'. DNA was isolated from 48 pecan and hickory accessions selected to strategically represent the genetic diversity of the National Clonal Germplasm Repository (NCGR) Carya collections. The 19 SSR primers that produced good amplification products in `Halbert' were used to evaluate the collection, with 11 revealing polymorphism. The number of fragments amplified with different primer combinations ranged from 4 to 32 in the 48 genotypes tested. Evaluation of the data confirms the utility of the microsatellites in delimiting known relationships.
, organs, or individuals) plus all other elemental forms ( Salt et al., 2008 )] ( Robinson, 1943 ; Robinson and Edgington, 1945 ; Robinson et al., 1938 , 1958 ). For example, Carya tomentosa (mockernut hickory) reportedly hyperaccumulates REEs in
ponder—Leafminers and hickory shuckworm in New Mexico, 2010. Proc. 45 th Annu. Western Pecan Growers Assn., Las Cruces, NM. p. 8–10 Thalmann, C. Freise, J. Heitland, W. Bacher, S. 2003 Effects of defoliation by horse chestnut leafminer ( Cameraria
Resources (NCGR) for Pecans and Hickories maintains several orchards in Burleson County, TX (lat. 30°31′ N, long. 96°25′ W). Trees in the present test were a part of the College Station Mexican (CSM) Provenance orchard, located near College Station, TX (lat
.E. Kerrihard, A.L. 2017 Chemical and nutritive characteristics of tree nut oils available in the US market Eur. J. Lipid Sci. Technol. 119 1600520 Gong, Y. Pegg, R.B. 2017 Separation of ellagitannin-rich phenolics from U.S. pecans and Chinese hickory nuts using
studies of flowering pathways in woody perennial species, such as apple ( Malus × domestica ), citrus ( Citrus sp.), chinese hickory ( Carya cathayensis ), pear ( Pyrus sp.), pecan, and poplar ( Populus sp.) have confirmed conservation of several A