Structure and development of sperm bundles in the dragonflyAeshna juncea L. (Odonata)

Åbro, Arnold

doi:10.1002/(sici)1097-4687(199803)235:3<239::aid-jmor3>3.0.co;2-1

Cited by 7 publications

(2 citation statements)

References 4 publications

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“…Previous anatomical studies in Drosophila [4] as well as in several other insects [51,52] established that spermatids are tightly bundled towards the end of differentiation and before their release into the SV. This process is predicted to single out abnormal sperm after individualization and thus acts as a quality control step in spermiogenesis [1,4].…”

Section: Discussionmentioning

confidence: 99%

F-actin-based extensions of the head cyst cell adhere to the maturing spermatids to maintain them in a tight bundle and prevent their premature release in Drosophila testis

2009

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Background: In Drosophila, all the 64 clonally derived spermatocytes differentiate in syncytium inside two somatic-origin cyst cells. They elongate to form slender spermatids, which are individualized and then released into the seminal vesicle. During individualization, differentiating spermatids are organized in a tight bundle inside the cyst, which is expected to play an important role in sperm selection. However, actual significance of this process and its underlying mechanism are unclear.

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Section: Discussionmentioning

confidence: 99%

F-actin-based extensions of the head cyst cell adhere to the maturing spermatids to maintain them in a tight bundle and prevent their premature release in Drosophila testis

2009

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“…1A, E, F, G; Breland & Lino‐Neto et al , 2008; Simmons, 1970; Sasakawa, 2007; Takami & Sota, 2007), members of the hymenopteran suborder Symphyta (Fig. 1B; Quicke et al , 1992; Schiff et al , 2001) and several species of dragonflies (Abro, 1998). Although referred to as spermatozeugmata, the conjugates of the gymnolaemate bryozoan Membranipora membranacea are also probably spermatodesms, as the syncytial sperm occur in aggregates of 32 or 64 (Temkin & Bortolami, 2004), and thus are likely generated by a spermatogenic mechanism (see Section V.2 a ).…”

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confidence: 99%

Evolution of intra-ejaculate sperm interactions: do sperm cooperate?

2010

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Sperm are often considered to be individuals, in part because of their unique genetic identities produced as a result of synapsis during meiosis, and in part due to their unique ecology, being ejected away from the soma to continue their existence in a foreign environment. Selection at the level of individual sperm has been suggested to explain the evolution of two enigmatic sperm phenotypes: sperm heteromorphism, where more than one type of sperm is produced by a male, and sperm conjugation, where multiple sperm join together for motility and transport through the female reproductive tract before dissociation prior to fertilization. In sperm heteromorphic species, only one of the sperm morphs typically participates in fertilization, with the non-fertilizing "parasperm" being interpreted as reproductive altruists. Likewise, in species with sperm conjugation, high levels of sperm mortality have been suggested to be required for conjugate break-up and this has been considered evidence of kin-selected altruism. However, it is unclear if sperm possess the heritable variation in fitness (i.e. are individuals) required for the evolution of cooperation. We investigate the question of sperm individuality by focusing on how sperm morphology is determined and how sperm conjugates are formed. Concentrating on sperm conjugation, we discuss functional hypotheses for the evolutionary maintenance of this remarkable trait. Additionally, we speculate on the potential origins of sperm heteromorphism and conjugation, and explore the diversification and losses of these traits once they have arisen in a lineage. We find current evidence insufficient to support the concept of sperm control over their form or function. Thus, without additional evidence of haploid selection (i.e. sperm phenotypes that reflect their haploid genome and result in heritable differences in fitness), sperm heteromorphism and conjugation should be interpreted not as cooperation but rather as traits selected at the level of the male, much like other ejaculatory traits such as accessory gland proteins and ejaculate size.

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Morphostructural investigation on spermatozoa and sperm bundles of the leafhopper Balclutha brevis Lindberg 1954 (Hemiptera: Deltocephalinae)

2016

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Structure and development of sperm bundles in the dragonflyAeshna juncea L. (Odonata)

Cited by 7 publications

References 4 publications

F-actin-based extensions of the head cyst cell adhere to the maturing spermatids to maintain them in a tight bundle and prevent their premature release in Drosophila testis

F-actin-based extensions of the head cyst cell adhere to the maturing spermatids to maintain them in a tight bundle and prevent their premature release in Drosophila testis

Evolution of intra-ejaculate sperm interactions: do sperm cooperate?

Morphostructural investigation on spermatozoa and sperm bundles of the leafhopper Balclutha brevis Lindberg 1954 (Hemiptera: Deltocephalinae)

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