Abstract
Self-Incompatibility in S-RNase-Based Systems: Are there Differences in the Pollen Rejection Mechanisms Among Species?
Highlights
Self-incompatibility (SI), defined as the inability to produce zygote after self-pollination in fertile plants [1,2], is one of the main barriers in plants preventing inbreeding while promoting genetic variability in future generations.Among angiosperms, SI is broadly classified as heteromorphic and homomorphic systems [1]
Both self- and non-self pollen can germinate on the stigmatic surface (Figure 1), and the pollen tube (PT) begin their journey towards the ovary through the extracellular matrix (EM) of the stylar transmitting tissue (STT)
We propose that Programmed Cell Death (PCD) might be involved in the pollen rejection response in Nicotiana
Summary
Self-incompatibility (SI), defined as the inability to produce zygote after self-pollination in fertile plants [1,2], is one of the main barriers in plants preventing inbreeding while promoting genetic variability in future generations. SSI has been deeply studied in Brassicaceae The research on this has identified both S determinants, how they interact, and determined the resultant signaling cascade triggered in an incompatible cross that prevents pollen germination on the stigmatic surface [rev. The S-RNase-based SI system has been studied in Solanaceae, in Nicotiana and Petunia Both self- (incompatible) and non-self (compatible) pollen can germinate on the stigmatic surface (Figure 1), and the PTs begin their journey towards the ovary through the extracellular matrix (EM) of the stylar transmitting tissue (STT). Four of them are pistil-expressed genes: HT-B, 120K, NaStEP, and NaTrxh [31,32,33,34]; and five from the pollen side: PhUBC1, SSK1, MdABCF, PiCUL1-G, and NaSIPP [29,3538] Their function in pollen rejection was proved by gain and loss of function assays in transgenic plants
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