Table 1. Expression Levels of Arabidopsis Pollen Aquaporin Genes TIP5;1, TIP1;3, NIP4;1, and NIP4;2 during Pollen Development and Pollen Tube Growth.
| Microarray | Aquaporin | UCP | BCP | TCP | MP | HP | In Vitro PT | Semi-in Vivo PT | Sperm Cells |
|---|---|---|---|---|---|---|---|---|---|
| Honys and Twell (2004) | TIP5;1 | 1,018 | 1,263 | 1,981 | 3,101 | ||||
| TIP1;3 | 852 | 1,899 | 4,792 | 1,563 | |||||
| NIP4;1 NIP4;2 | 917 | 1,143 | 1,754 | 560 | |||||
| Wang et al. (2008) | TIP5;1 | 6,117 | 6,200 | 4,612 | |||||
| TIP1;3 | 555 | 490 | 1,606 | ||||||
| NIP4;1 NIP4;2 | 42 | 55 | 5,198 | ||||||
| Qin et al. (2009) | TIP5;1 | 29,889 | 29,625 | 25,765 | 25,816 | ||||
| TIP1;3 | 3,020 | 3,194 | 3,244 | 5,306 | |||||
| NIP4;1 NIP4;2 | 361 | 510 | 6,166 | 18,426 | |||||
| Borges et al. (2008) | TIP5;1 | 6,119 | 23,230 (P) | ||||||
| TIP1;3 | 5,397 | 69 (A) | |||||||
| NIP4;1 NIP4;2 | 201 | 63 (P) |
Expression values from unicellular pollen (UCP), bicellular pollen (BCP), tricellular pollen (TCP), and mature pollen (MP) were taken from Honys and Twell (2004). Hydrated pollen grains (HP), in vitro pollen tubes (PT), and semi-in vivo pollen tubes (PT) from Wang et al. (2008) and Qin et al. (2009). Sperm cells were from Borges et al. (2008). (A), absent; (P), present. Data correspond to the mean absolute values obtained in each microarray.