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What does HAP stand for?

HAP stands for S-heteroallelic pollen

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S-heteroallelic pollen (HAP) grains are usually diploid and contain two different S-alleles. Curiously, HAP produced by tetraploids derived from self-incompatible diploids are typically self-compatible. The two different hypotheses previously advanced to explain the compatibility of HAP are the lack of pollen-S expression and the “competition effect” between two pollen-S gene products expressed in a single pollen grain.
Tetraploids derived from self-incompatible diploids are known to produce compatible S-heteroallelic pollen (HAP; De Nettancourt 1977), and this was also observed with our S. chacoense tetraploids. As an illustration, the breeding behavior of tetraploids containing two different S-loci (plants G4, L25, V28, F38, F55, and 1022) or three (F20) is shown in Table 1. These plants all produce diploid pollen, about two-thirds of which contain two different S-alleles and are thus fully self-compatible (see pollinations along the diagonal).
Luu DT, Qin X, Laublin G, Yang Q, Morse D, Cappadocia M (2001) Rejection of S-heteroallelic pollen.
Luu DT, Qin X, Laublin G, Yang Q, Morse D, Cappadocia M (2001) Rejection of S-heteroallelic pollen.
The in-hibitor models thus predict incompatibility for HAP, incontrast with experimental observations. We report here that P11P13HAP is accepted by stylescontaining the S11- and S13-RNases but rejected by stylesexpressing the dual S11/13HVapb-RNase. This demon-stratesthatpollenSIcomponentsarefunctionalinHAP,thus ruling out gene inactivation. We propose that pol-len-S acts as a tetramer and that heterotetramers, suchas would be produced in HAP, are unable to blockinhibitor binding and thus produce compatible pollen. RESULTSTetraploids derived from self-incompatible diploidsare known to produce compatible S-heteroallelic pollen.
F1000Prime Recommended Article: Rejection of S-heteroallelic pollen by a dual-specific s-RNase in Solanum chacoense predicts a multimeric SI pollen component.
The in-hibitor models thus predict incompatibility for HAP, incontrast with experimental observations. We report here that P11P13HAP is accepted by stylescontaining the S11- and S13-RNases but rejected by stylesexpressing the dual S11/13HVapb-RNase. This demon-stratesthatpollenSIcomponentsarefunctionalinHAP,thus ruling out gene inactivation. We propose that pol-len-S acts as a tetramer and that heterotetramers, suchas would be produced in HAP, are unable to blockinhibitor binding and thus produce compatible pollen. RESULTSTetraploids derived from self-incompatible diploidsare known to produce compatible S-heteroallelic pollen.