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1,359 results
  • Three new species of Lachemilla (Rosaceae) from South America. [Journal Article]
    PhytoKeys 2019; 127:93-119Morales-Briones DF, Romoleroux K, Tank DC
  • Three new species of Lachemilla (Rosaceae), two from Colombia and one from Peru, are described and illustrated. Lachemillarothmaleriana is characterized by its stout stems, sericeous-villous indumentum, and wide ascending sheaths with trilobate lateral lobes. Lachemillaargentea presents a unique combination of tripartite basal leaves with an adaxial silvery villous indumentum, and decumbent branc…
  • Morphological changes during juvenile-to-adult phase transition in sorghum. [Journal Article]
    Planta 2019Hashimoto S, Tezuka T, Yokoi S
  • CONCLUSIONS: Morphological and genetic markers indicate that in sorghum, the juvenile-to-adult phase transition occurs during the fourth and fifth leaf stages. This timing differs from those reported for other plants. The juvenile-to-adult (JA) phase transition is an important event for optimizing vegetative growth and reproductive success in plants. Among the Poaceae crops, which are a vital food source for humans, studies of the JA phase transition have been restricted to rice and maize. We studied the morphological and genetic changes that occur during the early development of sorghum and found that dramatic changes occur in shoot architecture during the early vegetative stages. Changes were observed in leaf size, leaf shape, numbers of trichomes, and size of the shoot apical meristem. In particular, the length/width ratios of the leaf blades in the fifth and upper leaves were completely different from those of the second to fourth leaves. The fifth and upper leaves have trichomes on their adaxial sides, which were absent on the lower leaves. We also analyzed expression of two microRNAs that are known to be molecular markers of the JA phase transition and found that expression of miR156 was highest in the second to fourth leaves and then was gradually down-regulated, whereas miR172 expression followed the opposite pattern. These results suggest that in sorghum, the second and third leaves represent the juvenile phase, the fourth and fifth leaves are in the transition stage, and the sixth and upper leaves are in the adult phase. Thus, the JA phase transition occurs during the fourth and fifth leaf stages. These findings are expected to be useful for understanding the early development of sorghum.
  • Transforming compound leaf patterning by manipulating REVOLUTA in Medicago truncatula. [Journal Article]
    Plant J 2019Zhou C, Han L, … Wang ZY
  • Leaves are derived from the shoot apical meristem with three distinct axes: dorsoventral, proximodistal and mediolateral. Different regulators are involved in the establishment of leaf polarity. Members of the class III homeodomain-leucine zipper (HD-ZIPIII) gene family are critical players in the determination of leaf adaxial identity mediated by microRNA165/166. However, their roles in compound…
  • Multiple steps of leaf thickening during sun-leaf formation in Arabidopsis. [Journal Article]
    Plant J 2019Hoshino R, Yoshida Y, Tsukaya H
  • Plant morphological and physiological traits exhibit plasticity in response to light intensity. Leaf thickness is enhanced under high light (HL) conditions compared to that under low light (LL) conditions due to increases in both cell number and size in the dorsoventral direction. However, the regulation of such phenotypic plasticity in leaf thickness (namely, sun- or shade-leaf formation) during…
  • Fine mapping of an up-curling leaf locus (BnUC1) in Brassica napus. [Journal Article]
    BMC Plant Biol 2019; 19(1):324Yang M, Huang C, … Guan R
  • CONCLUSIONS: An up-curling leaf mutant Bnuc1 was controlled by one dominant locus BnUC1. This locus had positive effects on photosynthetic efficiency, negative effects on some agronomic traits, and may help to increase planting density in B. napus.
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