Glossary by Dr. Donald Spoon, with annotations by Dr. Spoon.

Go to original word document sent by Dr. Donald Spoon

List of terms:

Alelle, Allopolyploid, Alternation of Generation, Amphidiploid, Aneuploid, Arilbred, AB, Amoena, Anthocyanin Pigment, Anthers, Autopolyploid, Backcross, BB, Border Bearded, Beard, Bd or Beards, Bds, Bee pod, Bicolor, Bitone, Blade, Blend, Border, Bride’s Halo Border Pattern, Bracts, Calyx, Capsule, Carotinoids, Centromere, Chimera,

Definitions:

---- Alelle. A distinct form of a gene producing a specific trait.

An example is the anthocyanin flower patterns (dominant no pattern, recessives plicata, luminata, and glaciata) at the plicata locus. In tetraploid bearded irises there may be only four different alleles on the four homologous chromosomes at the same gene locus, such as the plicata locus. Dominant alleles (Pl for no plicata pattern) require only one allele or dose (Pl,pl,pl,pl,) of the four doses to be expressed. Sometimes, each additional dominant dose makes the trait more or less prominent by a dosage effect as with the dominant inhibitor (Is) of anthocyanin only in the standards. The recessive alleles usually require four doses (pl,pl,pl,pl) to be expressed unless the other alleles are recessives, than there can be a peck order or an overlapping expression of the recessive alleles. Some dominant alleles at the same locus are codominant producing a mixing inheritance with a trait intermediate between the two dominant traits. Likewise, some recessive alleles at the same locus are corecessive with the traits overlapping equally or unequally creating an intermediate trait. The colloquial term for allele is factor.

---- Allopolyploid . Triploid, tetraploid, or octaploid hybrid having sets of chromosomes with nonhomologous structure from different species.

In the autopolyploid all sets of chromosomes have similar, homologous chromosomes.

---- Alternation of Generation . In plants where the spore forming sporophyte repeatedly follows the gamete producing gametophyte.

With combination the reduced chromosomal numbered male and female gametes redouble the chromosome number to produce the zygote. The zygote develops into the embryo that develops into the new sporophyte plant that by meiosis (reduction and division) produces microgametophytes that produce the male gametes and macrogametophytes that produce the female gametes.

---- Amphidiploid . Hybrid from two tetraploid species each contributing two sets of chromosomes in their gametes for a total of four sets in the zygote. The two diploid sets are so different morphologically that they do not independently assort at meiosis, thus the tetraploid hybrid behaves more like a diploid.

---- Aneuploid . Hybrid that lacks or adds one or more chromosomes in the sets of chromosomes.

The result is a chromosome number less or more than the multiple of sets would dictate. The mismatches at meiosis when the homologous chromosomes line up and synapse may make the hybrid sterile.

---- Arilbred, AB. An iris cultivar that is at least 1/8th aril (oncocylous or regalia bearded irises) crossed with other bearded irises.

---- Amoena. (ah me nut) White standards and colored falls.

Amoena It is difficult to give an operational definition of the term amoena, meaning ‘pleasing’. Originally, amoena meant only cultivars with white standards and anthocyanin pigmented falls, and later just colored falls that included pink and yellow amoenas. Possibly, the best modern description is anthocyanin pigment in the falls and none in the standards. In such an amoena, the standards can be white, cream, yellow, pink, peach, red-orange, or orange. Also, in the falls the anthocyanin pigment pattern can overlay any carotenoid pattern. Amoena luminatas have only the fall’s anthocyanin pattern displayed as a luminata color pattern. Amoena plicatas have a plicata color pattern only in the falls. The anthocyanin amoena patterns are produced by two different genes; in one, the pattern is recessive requiring four recessive doses for expression and in the other, the pattern is dominant with dosage effects so that only with four doses (Is Is Is Is) are the standards free of anthocyanin pigment. Complicating the usage of the term, there are patterns also called amoena in the carotenoid pigment colors that require four recessive alleles for the standards to be white. These are named for the falls color, such as yellow amoena, pink amoena, and orange amoena.

---- Anthocyanin pigment . The main water soluble pigment present in the central vacuole of the epidermal cells that give the iris flower their nearly black, violet, blue, light floridor blue, maroon, brick red, brown, tan, and orchid pink coloration.

There are several groups of these water soluble, cell-sap pigments that are lumped together under the term ‘anthocyanin’ that is the major group.

---- Anthers. Male structure bearing two elongate lobes filled with maturating pollen.

When fully developedthe lobes rupture or dehisce releasing the powdery pollen grains. The anther plus its supportive filament is the stamen.

---- Autopolyploid. Hybrid with 4 or 8 sets of chromosomes in which all sets are homologous with similar structures.

Autopolyploids are produced by natural processes or chemical induction.

---- Backcross . Inbreeding when cultivar or species hybrid is crossed as pod or pollen parent on either of its parents.

---- BB. Border bearded irises , 16-27.5” (41-70 cm) tall stalks that bloom with the tall beardeds (TBs) and MTBs.

Border beardeds are mostly from TB breeding. With esthetically pleasing proportion Border Beardeds have larger and wider flowers as well as thicker stalks than the MTBs of similar stalk heights. A seedling with stalks shorter than 27.5” (70 cm) yet TB sized flowers is best used for further hybridizing and not introduced unless it carries unique traits or color of considerable value to other hybridizers. (Ben Hager introduced his excellent parent for modern formed, reliable rebloomers, the very short TB ‘Bonus Mama’)

---- Beard, Bd or Beards, Bds . Elongate group of fuzzy, thin hairs in the middle of the falls, at their bases and extending about a third to a fourth of the length of the falls.

Bearded irises are called pogon and beardless called apogon (a- means without). The Eupogons (true bearded) have bushy beards with multicelllular hairs while pogons like arils have sparse beards with unicellular hairs. Genetically, long, wide beards are dominant to short, narrow beards.

---- Bee pod . Term used to describe a pod pollinated by a bee, bumblebee, or other flying pollinators, such as sphinx moths.

Our experience is that most pods that are not human pollinated are pollinated by crawling insects, and the offspring of these pods indicate that the flower was more likely to be self pollinated than cross pollinated as can be determined by examining the traits of the offspring.

---- Bicolor . Color pattern with standards a different color than the falls as in various dominant and recessive amoenas, inverse amoenas, variegatas, dark tops, etc.

This broadly general, nonspecific term is ambiguous and does not distinguish the type of color pattern or combination. It does not include color patterns with two different colors in the falls or in the petals and beards.

---- Bitone . Color pattern with the falls a darker shade of the color in the standards.

Neglectas are blue-violet or violet bitones with the falls the darker shade. When the shade difference is slightly visible it is accurately called a minimal bitone. Reverse bitones are when the falls are the lighter shade.

---- Blade. Each leaf in the fan of foliage and also the expanded leaf-like part of the flower petals (also called a disc).

The base of the blade where it encloses the rhizome is the sheath. The narrow base of the flower petal is the claw. It is appropriate for the iris, formerly called the sword lily in the middle east, to have its leaves called blades, arranged in a fan of sword blades like in the grand hall of a castle.

---- Blend . Color pattern with obvious combination of two or more, unevenly mixed colors often from opposite sides of the color wheel, such as purple and yellow overlapping to produce areas of maroon.

A blend can have the different colors also appearing separately in certain areas. A self can be a blend of two 3 completely mixed colors, such as yellow and violet giving maroon, but it would not be called a blend color pattern.

---- Border . A recessive trait where the edge of the falls lacks anthocyanin pigment in a broad area around the periphery of the falls.

The border can be white or any of the carotenoid colors or color patterns. Sometimes called a halo or rim when the border is narrow. If the border is very wide it can be called a band or a graded band that is more intensely pigmented on the periphery.

---- Bride’s Halo Border Pattern . A carotenoid pigmented border around both the falls and standards.

The ground inside the border can be white or have an anthocyanin pigment pattern.

---- Bracts . Leaf like blades of unequal lengths arising in pairs from the node at each branch of the stalk.

Bracts can develop by the unequal lengthening of the two spathes inclosing the flower cluster.

---- Calyx . Grouping of the three sepals, called falls in irises.

---- Capsule . Unruptured, dried seed pod developed from the flower ovary.

---- Carotenoids , “Carotins.” Lipid soluble pigments in chloroplasts and chromoplasts including light yellow xanthophylls and deeper yellow carotenes.

The red-orange carotene pigment is called lycopene. The authors have coined the term “Carotins” for all these lipid soluble pigments to be used with “Cyanins” for all water soluble pigments. Both terms are three syllable words with first syllable accents to substitute or to be used as synonyms for the five syllable words Carotenoids and Anthocyanins.

---- Centromere . Area of the chromosome where the spindle fibers attach and where the chromatids are joined before being pulled apart in the anaphase stage of division.

---- Chimera . Variation in a flower part that is passed on to the new increases such as the tendency to have a random darker streak in a petal, a single darker petal, or have one half the flower a different color or white. Also, where different parts of the flower are diploid or tetraploid.

---- Chromatids. Conjoined, replicated condensed daughter chromosomes united at their kinetochores or centromere.

Under Construction. See Attached original at beginning of page

-- BobPries - 12 Feb 2019
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