Is there any kind of biological/scientific factor behind this?
Most varieties of corn bred for contemporary use have between 8-20 rows the kernels (Bommert et al. 2013.. Almost all varieties have actually an even number of kernel rows. This is as result of the early development of the ear. Ears of corn are arisen from pistillate flower on the ear (Bortiri and Hake 2007). Pistillate flowers space the female flowers, therefore they will bear seeds. The seeds room the individual kernals.
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Long prior to the ear the corn has the kernels, it has several rows of flowers. The flowers develop on the ear in long rows. At an early stage in advance of the ear, the separation, personal, instance rows of flowers double, developing rows of double flowers, as shown in the an easy diagram indigenous Bortiri and Hake (2007). Both male flowers (left) and also female flowers (right) have actually this two-row structure.
You deserve to see the double pattern forming in this scanning electron micrograph the the really early breakthrough of the ears, also from Bortiri and also Hake (2007). Notification the tip of the ear still has actually the single rows however the rows start to double a small farther away from the tip. You deserve to usually view this even on mature ears of corn.
You deserve to see remnants the this plan if you look closely at a cross section of an ear that corn. I"ve attracted arrows to display the connections where the flower once associated together. If girlfriend look very closely at the ear of corn, you deserve to identify the rows. The double rows have actually the kernels precisely opposite of every other. Every doubled heat is staggered slightly from the bordering rows. I"ve drawn lines to highlight each double row. These 2 photos are from the agriculture extension office at Purdue University.
The development of corn flowers and all various other flowers follows what is dubbed the ABC version of floral development (Krizek and also Fletcher 2005). The model has actually been significantly expanded due to the fact that molecular genes has boosted our understanding of flower development. Plenty of genes room involved, and also the gene are offered in different ways through different species of plants. The sample of gene consumption is similar in most grasses, which explains the double-flower plan of corn. Most grasses have actually the double-flower arrangement, and also corn is a form of grass.
Some extremely inbred variety of corn can develop odd numbers of kernel rows, as displayed in number below, taken native Bommert et al. (2013). KRN is kernel row number. RIL is recombinant inbred lines, which means different arrays that have actually been inbred for particular traits. Thirteen is possible, together are various other odd row numbers. An odd number of rows is unusual, however.
Bomblies, K. Et al. 2003. Duplicate FLORICAULA/LEAFY homologs zfl1 and also zfl2 regulate inflorescence architecture and flower patterning in maize. Advancement 130: 2385-2395.
Bommert, P. Et al. 2013. Quantitative sport in maize kernel row number is controlled by the FASCIATED EAR2 locus. Nature genetics 45: 334-337.
Bortiri, E. And S. Hake. 2007. Flowering and also determinacy in maize. Journal of experimental Botany 58: 909-916.
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Krizek, B.A. And also J.C. Fletcher. 2005. Molecule mechanisms the flower development: one armchair guide. Nature Reviews genetics 6: 688-698.