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4 results for “floral utilization”
Data from: Utilizing next-generation sequencing to resolve the backbone of the Core Goodeniaceae and inform future taxonomic and floral form studies
Though considerable progress has been made in inferring phylogenetic relationships of many plant lineages, deep unresolved nodes remain a common problem that can impact downstream efforts, including taxonomic decision-making and character reconstruction. The Core Goodeniaceae is a group affected by this issue: data from the plastid regions trnL-trnF and matK have been insufficient to generate adequate support at key nodes along the backbone of the phylogeny. We performed genome skimming for 24 taxa representing major clades within Core Goodeniaceae. The plastome coding regions (CDS) and nuclear ribosomal repeats (NRR) were assembled and complemented with additional accessions sequenced for nuclear G3PDH and plastid trnL-trnF and matk. The CDS, NRR, and G3PDH alignments were analyzed independently and topology tests were used to detect the alignments' ability to reject alternative topologies. The CDS, NRR, and G3PDH alignments independently supported a Brunonia (Scaevola s.l. (Coopernookia (Goodenia s.l.))) backbone topology, but within Goodenia s.l., the strongly-supported plastome topology (Goodenia A (Goodenia B (Velleia + Goodenia C))) contrasts with the poorly supported nuclear topology ((Goodenia A + Goodenia B) (Velleia + Goodenia C)). A fully resolved and maximally supported topology for Core Goodeniaceae was recovered from the plastome CDS, and there is excellent support for most of the major clades and relationships among them in all alignments. The composition of these seven major clades renders many of the current taxonomic divisions non-monophyletic, prompting us to suggest that Goodenia may be split into several segregate genera.
Complementary water and nutrient utilization of perianth structural units help maintain long floral lifespan in Dendrobium
<p><span>Most orchids have high ornamental value with long-lived flower. However, the mechanisms by which orchids maintain floral longevity are poorly understood. Here, we hypothesized that long floral longevity in Dendrobium is maintained by high resource investment and complementary water and nutrient utilization in different structural units of the perianth. To test this hypothesis, we determined which water- and nutrient-related traits are correlated with flower longevity in twenty-three Dendrobium species or cultivars and examined the variations of the related traits during flower development of one long-lived cultivar. We found that floral longevity was correlated with dry mas per unit area of perianths and total flower biomass, which indicates that maintaining long floral longevity requires increased resource investment. During development of long-lived flowers, labella showed high capacity for water storage and nutrient reutilization, which can partly remedy high water demand and biomass investment. Sepals and petals, in contrast, had stronger desiccation avoidance and higher metabolic activity with lower biomass investment. These findings indicate that Dendrobium flowers maintain longevity by complementary water and utilization strategies in the sepals, petals and labella, with labella consuming more water and nutrients to extend flower display, while sepals and petals use a more conservative strategy.</span></p>
Data from: Utilizing next-generation sequencing to resolve the backbone of the Core Goodeniaceae and inform future taxonomic and floral form studies
Open the record for dataset details and reuse information.
Complementary water and nutrient utilization of perianth structural units help maintain long floral lifespan in Dendrobium
Open the record for dataset details and reuse information.
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