Table of Contents
How is spikelet fertility measured?
Specific calculation formula is as follows: Spikelet fertility (%) = number of fertile grains × 100/total number of florets = (number of completely filled grains + number of partially filled grains) × 100/total number of florets.
What are plant spikelets?
spikelet. / (ˈspaɪklɪt) / noun. botany the unit of a grass inflorescence, typically consisting of two bracts (glumes) surrounding one or more florets, each of which is itself surrounded by two bractsSee lemma 1, palea. the small inflorescence of plants of other families, esp the sedges.
How would you distinguish a floret from a spikelet?
In grasses In Poaceae, the grass family, a spikelet consists of two (or sometimes fewer) bracts at the base, called glumes, followed by one or more florets. A floret consists of the flower surrounded by two bracts, one external—the lemma—and one internal—the palea.
Is a spikelet a flower?
Flower heads of grasses are described according to the arrangement of a special floral unit called a spikelet rather that of the individual flowers. A spikelet consists of one or more flowers (florets) plus two basal membranes (glumes).
How many florets are in a spikelet?
two florets
There are actually two florets per spikelet – one large bisexual floret above and a tiny reduced one below that looks like a flap of tissue at the base of the upper floret.
Is the reproductive unit of a spikelet?
floret: small flower; the reproductive unit of a grass spikelet consisting of a lemma and palea and the small flower they contain (see spikelet).
Why is emasculation performed before anthesis?
Explanation: Emasculation is done in flowers before anthesis to prevent autogamy.
What is emasculation and hybridization?
We know hybridization is the method of selective breeding. Thus, anthers have to be removed from a bisexual flower before they release pollen grains. This step of removal of anther using forceps is termed as emasculation.
What is spike spikelet?
A floret is constituted by a flower engirdled by two bracts – one internal palea and one external lemma. Poaceae commonly exhibit spike of spikelets. Characteristically, their flowers are oriented in spikelets wherein each of the spikelets has one or more florets.
What is spikelet type of inflorescence?
Hint: Spikelet inflorescence is a type of elongated main-axis inflorescence which further is a type of racemose inflorescence. Spikelets are seen in grass species. Spikelets are represented by individual flower units. There is no calyx or corolla in a floret.
What is spike of spikelet?
What anthesis means?
Definition of anthesis : the action or period of opening of a flower.
Which part is removed during emasculation?
anthers
Emasculation is a method in which anthers are removed from the flowers to prevent self-pollination.
What is called emasculation?
Definition of emasculate transitive verb. 1 : to deprive of strength, vigor, or spirit : weaken. 2 : to deprive of virility or procreative power : castrate. 3 : to remove the androecium of (a flower) in the process of artificial cross-pollination.
What is the meaning of spikelet?
Definition of spikelet : a small or secondary spike specifically : one of the small few-flowered bracted spikes that make up the compound inflorescence of a grass or sedge First Known Use of spikelet 1793, in the meaning defined above
How many florets does a spikelet have?
Each spikelet has one or more florets. The spikelets are further grouped into panicles or spikes. The part of the spikelet that bears the florets is called the rachilla. A spikelet consists of two (or sometimes fewer) bracts at the base, called glumes, followed by one or more florets.
How many fertile spikelets are formed in six-rowed barley?
Three fertile spikelets are formed at each rachis node in six-rowed barley, and only the central spikelet at each rachis node will set seed in two-rowed barley. The vrs1.a allele is present in most six-rowed barley and the common allele in two-rowed barley is Vrs1.b.
What is a palea in a spikelet?
Palea, in Poaceae, refers to one of the bract-like organs in the spikelet. The palea is the uppermost of the two chaff-like bracts that enclose the grass floret (the other being the lemma ). It is often cleft at the tip, implying that it may be a double structure derived from the union of two separate organs.