degenerate megaspore [
PO:0000245; plant anatomy term ]
In monosporic and bisporic megasporogenesis: the megaspore(s) that would not participate in megagametogenesis.
More Synonyms: 退化大胞子、胞子形成に寄与しない大胞子 (Japanese), megaspora degenerativa (Spanish), PO:0006495, Poaceae degenerate megaspore
Comments: If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).
dehiscence zone [
PO:0025092; plant anatomy term ]
A portion of plant tissue that is part of a plant structure and consists of a narrow band of cells that undergoes dehiscence upon maturation of the structure.
More Synonyms: 裂開帯 (Japanese), zona de dehiscencia (Spanish)
Comments:
determinate nodule [
PO:0004539; plant anatomy term ]
A root nodule characterized by a dividing infected cells and bacteria, vascular transfer cells absent and cell division is in the outer cortex.
More Synonyms: nódulo determinado (Spanish), 有限型根粒 (Japanese)
Comments: Nodules are not persistent.
diarch protoxylem [
PO:0025559; plant anatomy term ]
A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has two protoxylem strands or poles, and differentiation progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the plant axis (PO:0025004).
More Synonyms: protoxilema diarco (Spanish), 二原型原生木部 (Japanese)
Comments:
disk flower [
PO:0025332; plant anatomy term ]
A small flower (PO:0009046) in the center of a head-type (capitulum) inflorescence (PO:0009049).
More Synonyms: disc floret, disk floret, flor del disco (Spanish), 中心花 (Japanese)
Comments: Found in the Asteraceae. May be actinomorphic or bilabiate, often bisexual. Usually surrounded by and different in form from ray flowers (PO:0025331).