. speciosa . At least three epithets have been used to designate crosses between L. indica and L. speciosa . First, Lagerstroemia × matthewsii Searl is indicated to refer to crape myrtles hybridized by C. Matthews in Queensland, Australia, in the 1880
Lagerstroemia indica L., commonly referred to as crape myrtle or crepe flower, is an upright, wide-spreading, deciduous shrub or small tree in the loosestrife family Lythraceae. It is native to the Himalayas through southern China, Southeast Asia
Lagerstroemia indica (crape myrtle) is a deciduous shrub or small tree with a long cultivation history. The plant is a summer landscape flowering plant that popular in many countries because of its long-lasting bloom and colorful flowers
A diurnal increase in the concentration of amino acids (and N/C ratio) in xylem fluid of Lagerstroemia indica occurred from ca. 1230 to 2030 HR. Diurnal trends were similar for irrigated or non irrigated plants. Since the concentration of total organic nitrogen, total amino acids and most individual amino acids (but not organic acids or sugars) were also proportional to xylem tension (Xt) two experiments were performed to discern whether variations in chemistry were due to diurnal changes in moisture stress. First, L. indica when exposed to variable levels of moisture stress during midday manifested an increase in organic acids and a reduction in the N/C ratio. Second, chemical profiles of xylem fluid were collected at noon and midnight and were compared for plants exposed to a natural photoperiod, constant darkness, or continuous light. After 1 day the midday increase in concentrations of amino acids persisted for all treatments; the variation was greatest (10-fold) for plants in constant darkness where Xt varied from 0.20 to 0.25 MPa. Only plants exposed to continuous light lost this tendency after 3 days. Thus, the circadian rhythm was endogenous, terminated in continuous light and not mediated by changes in moisture stress. Glutamine accounted for most of the diurnal variation in total amino acids, organic nitrogen or N/C ratio in xylem fluid.
The effects and interactions of water stress and nutrient solution on water relations and concentrations of amino acids, organic acids and sugars in xylem fluid of `Methley' plum (Prunus salicina Lindl.) and `Carolina Beauty' crape myrtle (Lagerstroemia indica L.) during midday were determined. Container-grown plants were irrigated with water or nutrient solution (i.e., osmolarity = 138 mm) for 15 days, then irrigation was either continued or terminated for the next 5 days. The experiments were analyzed as factorial designs for each species separately, with the nutrient solution and irrigation status the last 5 days as the main factors. Xylem fluid tension increased ≈ 2- to 3-fold and leaf conductance to water vapor and transpiration were reduced ≈ 10-fold by withholding irrigation for both species; plant water relations of L. indica were also influenced by the nutrient solution. For both species, the osmolarity of xylem fluid was not altered by withholding irrigation. The predominant organic compounds quantified in both species were amides (i.e., glutamine and asparagine), arginine, and citric and malic acids. Sugars represented a small proportion (i.e., generally ≤ 1%) of total osmolarity. Irrigation altered the chemical profile of amino acids and organic acids to a greater degree than the nutrient solution. Water stress induced a 3-fold increase in total organic acids in xylem fluid of both species. The osmolarity and the concentration of most organic compounds in xylem fluid of P. salicina were not significantly affected by the nutrient solution. Arginine increased markedly in concentration by withholding irrigation or with the application of nutrient solution for L. indica. The concentration of most organic compounds did not vary greatly in response to variations in soil water or nutrient status. In conclusion, soil water-or nutrient-mediated changes in plant water relations exceeded changes in xylem fluid chemistry.
Abstract
The anthocyanins in the flowers of crapemyrtle (Lagerstroemia) species and cultivars are the 3-glucosides of delphinidin, petunidin, and malvidin. These three pigments are also present in most of the cultivars of rose of sharon (Hibiscus syriacus), but one cultivar contained cyanidin 3-glucoside as the major petal pigment Thus, the development of plants with “true-red” petals is remotely possible in rose of sharon but unlikely in crapemyrtle.
During recent freezes in the mid-south, crape myrtles have suffered severe freeze damage. Some increased levels of cold hardiness have been observed in the National Arboretum crape myrtle releases, but the degree of tolerance has not been documented. The relative cold hardiness of five hybrid crape myrtle cultivars `Muskogee', `Natchez', `Osage', `Tuskegee' and `Yuma' was determined using differential thermal analysis. Stem samples were collected from established trees at two locations, Poplarville, Zone 8 and Starkville, Zone 7 once per month from October through April. Freezing point suppression was determined from five samples from each cultivar and location. Observed exotherms ranged from -7C to -13C.
leaf spot severity and AUDPC in the 2004 planting compared with other crapemyrtle species and hybrid groups ( Table 3 ). Lagerstroemia indica × L. fauriei × L. limii and L. indica had the highest level of disease severity and AUDPC in all 3
endosperm ( Akhalkatsi et al., 1999 ; Casper and Wiens, 1981 ; Gao et al., 2017 ). Lagerstroemia indica is native to Asia and is a deciduous shrub or small tree belonging to the family Lythraceae. It has a long history of cultivation and is an important
There are more than 50 species of Lagerstroemia L. ( Cabrera, 2004 ; Furtado and Montien, 1969 ), but L. indica and L. fauriei have been the most extensively used in horticultural breeding programs. Lagerstroemia indica , native to southeast