Relationship between meiotic instability and fertility in F2 generation Arabusta coffee plants

Abstract

Parental plants, an F 1 interspecific hybrid and the F 2 generation from Arabusta coffee plants were investigated for meiotic behavior and viability of pollen to understand part of their reproductive biology that affects their possible use in coffee breeding programs. Both parental plants (C. canephora var. Robusta 4x and C. arabica var. dihaploid Bourbon Vermelho) showed a meiosis diploid-like behavior, despite presenting a small percentage of irregularities, just as occurred for the F 1 Arabusta hybrid. On the other hand, all F 2 plants showed a higher frequency of anomalies that compromised pollen viability. The highest meiotic indices were registered for three analyzed plants of the F 2 generation, and the pollen viability tests revealed the highest

Cytogenetic Toxicity and Infertile Properties of the Aqueous Extract of Cucumis melo Seeds (Cucurbitaceae) in Male Zonocerus variegatus Cell Model (Orthoptera: Pyrgomorphidae)

“…Being very reactive, terpenoids, especially cucurbitacins, become alkylating and therefore likely to form new methyl groups which are at the origin of the covalent bonds between the two strands of DNA called adducts [19,32]. The position, time and number of adducts formed on the DNA molecule are the causes of multifaceted chromosomal abnormalities [38,[39][40][41][42]. The inhibitory effect of the extract can also be attributed to the diversity of anaphase-1 abnormalities such as [AS]; the [AB]; the [AR] and finally the minority [AM+IA].…”