Calcium distribution in fertile and sterile anthers of thermosensitive male-sterile wheat

Regulation of carbohydrate metabolism during anther development in a thermo‐sensitive genic male‐sterile wheat line

“…The adverse effect of a specific duration of abiotic stress on anther development during meiosis is irreversible and no morphological abnormalities can be observed in pollen until the BP stage in most male sterile lines (Dorion et al, 1996; Ji et al, 2010; Koonjul et al, 2005; Li et al, 2019). We found that metabolite profiles of sterile anthers diverged from those of fertile anthers starting from the M stage and persisting through the TP stage.…”

“…BNS (Bainong sterility) is a thermo-sensitive genic male sterile wheat line characterised by anther fertility transformation in response to LT stress during meiosis. Abnormalities in sterile pollen, such as the failure of vacuole decomposition and the absence of starch accumulation, are observed at the BP stage, resembling features seen in pollen affected by abiotic stress (Ji et al, 2010;Li et al, 2019). Disruption in carbohydrate metabolism during anther development may affect starch accumulation, which is crucial for pollen germination, and lead to pollen abortion.…”

“…Abiotic stresses such as light, temperature, or drought can disrupt male sporogenesis, leading to pollen sterility and thus reducing crop yield. Although meiosis is the most sensitive stage to abiotic stress in male organs, cytological abnormalities are mainly observed at the bicellular pollen (BP) stages of sterile pollen (Ji et al, 2010; Koonjul et al, 2005; Li et al, 2019; Oliver et al, 2005). These observations suggest the presence of a highly stress‐sensitive event during meiosis that is crucial for subsequent male gametophyte development, and this event is likely triggered by an unidentified signal originating from the vegetative organs (Ji et al, 2010; Koonjul et al, 2005; Oliver et al, 2007).…”

“…These observations suggest the presence of a highly stress‐sensitive event during meiosis that is crucial for subsequent male gametophyte development, and this event is likely triggered by an unidentified signal originating from the vegetative organs (Ji et al, 2010; Koonjul et al, 2005; Oliver et al, 2007). The sterility of photo‐and/or thermo‐sensitive genic male sterile (PTGMS) lines is attributed to specific genes whose expression is regulated by light and/or temperature; these lines can be effectively utilised as either maintainer lines or sterile lines, depending on the prevailing conditions, and have great potential for incorporation into a two‐line breeding programme (Li et al, 2019). Nevertheless, anther development is a precisely regulated process, and despite its importance, many steps and their associated regulatory mechanisms remain poorly understood (Gómez et al, 2015).…”

Environment‐sensitive genic male sterility in rice and other plants

“…Hence, the cloning of environment‐sensitive genic male sterile genes and the study of their functions are conducive to the application of the two‐line hybrid method in crops. At present, a number of environment‐sensitive genic male sterile genes have been cloned, and the underlying mechanisms responsible for different types of environment‐sensitive genic male sterility have been characterized (L. Chen et al, 2009; H. Chen et al, 2020; Fan & Zhang, 2017; Gu, 2009; H. Li et al, 2009; Lu et al, 2006; W. Tang & Li, 1994; Z. Zhou, 2006) (Table 2).…”