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• W2167408925 abstract "‘Crepy & Casal showed that plants interacting with kin plants yielded more seeds compared with plants interacting with nonkin members, a clear indication of mutual benefit and cooperation.’ Plants depend on their dynamic root systems to provide nutrients and water to the rest of the plant, often competing with other plants for these necessities. Lateral root growth in plants has been shown to be a very plastic and nutrient-dependent process (Malamy & Ryan, 2001; Biedrzycki et al., 2010). Recently Biedrzycki et al. (2010) showed that root morphology of very young seedlings of A. thaliana responds to identity, supporting the contention that kin recognition can be a major force in the evolution of plants. By contrast, it has been argued that kin recognition is a manifestation of self-/nonself-recognition (Falik et al., 2005). Biedrzycki et al. (2010), showed that root exudates mediate the kinship response in A. thaliana. Various other studies have analyzed the belowground factors for kinship recognition in different plant species (Dudley & File, 2007; Bhatt et al., 2011; Fang et al., 2013). The question of how plants recognize kin or strangers can be approached through the genetic and molecular tools available with Arabidopsis. Interestingly, the paper by Crepy & Casal analyzed the aboveground interactions in a kin recognition process; this is one of the first reports to show an aboveground behavior response in plants exposed to kin members. Plants recognize cues to avoid self-incompatibility and self-fertilization (Sanabria et al., 2008), and they have also developed mechanisms to sense pathogens, mutualists, and parasitic plants through signals derived from roots (Keyes et al., 2007). However, even more subtle forms of recognition and sensing at the plant organ level have been identified (de Kroon, 2007) – for example, roots show responses to the neighboring roots’ genotype (Mahall & Callaway, 1996) and species (Huber-Sannwald et al., 1997; Dudley & File, 2007; Semchenko et al., 2007; Biedrzycki et al., 2010; Bhatt et al., 2011). While these studies demonstrate how plants use roots or root-derived cues to discriminate between self/nonself and kin/nonkin, there is no evidence that dictates the precise mechanism by which plants show this recognition behavior. Semiochemicals and volatile organic compounds (VOCs) have been suggested to be the potential cues that mediate the plant–plant response, but no genetic mechanism or chemicals have yet been elucidated to precisely regulate kin-/nonkin-recognition in plants. It is known that plants compete for space and nutrient acquisition. Studies focusing on belowground communications have shown that plants allocate more roots to sequester nutrients and that root allocation increases during kin–nonkin interactions compared with kin–kin interactions (Biedrzycki & Bais, 2010; Biedrzycki et al., 2010). Other lines of study involving different plant species have also shown that plants compete with nonrelated species more aggressively than with related kin members (Dudley & File, 2007; Murphy & Dudley, 2009). The recent findings that belowground interactions may have implications for plant recognition have garnered attention but have also been criticized for caveats related to the experimental procedures (Klemens, 2008). Contrary to the findings of Biedrzycki et al. (2010), work by Masclaux et al. (2010) showed competitive ability in A. thaliana accessions, negating the kinship response. Masclaux et al. (2010) evaluated aerial parts of the plants to show competitive ability within the accessions. The quantitative evaluation of the cooperative relationship is difficult as it also accounts for competitive interactions to sequester the common pool of nutrients. The foliar parts of plants behave differently during crowding and encroaching interactions from neighbors (Casal, 2012). Light sharing and shade avoidance are common features that plants experience during interactions with other plants (Casal, 2012). The changes in red to far-red (R : FR) ratios and low blue light interactions indicate plant canopy shade resulting in various growth modifications in aerial parts of the plants including reorientation of the leaves (Casal, 2012, 2013). Growth modifications in the form of reorientation of leaves both ‘horizontally’ and ‘vertically’ are called ‘shade-avoidance reactions’ (Casal, 2013). The presence of neighboring plants modifies the light environment and is perceived through phytochrome B (phyB) and cryptochrome 1 (cry1) (Keller et al., 2011; Casal, 2012). It is argued that photosensory receptors such as phytochrome and cryptochrome are able to perceive airborne signals generated by neighbors. There is a significant amount of work that has been performed to understand the functional importance of photosensory receptors in light signaling in plant communities (Casal, 2013), but the impact of photosensory receptors to perceive and recognize kin and nonkin interactions is not yet elucidated. Crepy & Casal employed a systematic approach of utilizing the power of genetics in the model system A. thaliana and showed the involvement of phyB, cry1 and shade avoidance 3 (sav3) in recognizing kin signals. It is often argued that photosensory signal-mediated aerial growth change, including leaf orientation, add fitness costs to the plant (Casal, 2013). Concomitantly, Crepy & Casal showed that plants interacting with kin plants yielded more seeds compared with plants interacting with nonkin members, a clear indication of mutual benefit and cooperation. The article by Crepy & Casal provides one of the first insights into the mechanism of kin recognition in plants. The article also shows cooperation within the plants interacting with kin. This is not the first time that plants showed an altruistic behavior while interacting with kin; other reports in different plant species have also shown an underground trait of minimal root allocation for kin–kin interactions (Dudley & File, 2007; Biedrzycki et al., 2010). The conception that kin behavior is altruistic is controversial, as most of the experiments showing kin interactions have not negated the possibility of a competitive environment. Plants used in the study by Crepy & Casal were only allowed to sense their neighbors through aerial interactions, thereby negating any root–root competition (Fig. 1). The results clearly indicate that mutants impaired in photosensory receptors failed to rearrange their leaves under kin–kin interactions compared with the wild-type plants. Plants are sessile organisms, and are incapable of selecting the genotype of their neighbors. Over time, plants have evolved to produce a plethora of small-molecular-weight compounds as signaling and defense molecules (Bais et al., 2006). Another report on kin interaction indicates the involvement of a root-derived signaling molecule for kin recognition (Biedrzycki et al., 2010) (Fig. 1). Although Crepy & Casal avoided root interactions in their study, it could be argued that volatiles-derived through leaves may still hold a key to modulating orientation and reorientation of leaves. An experiment completely negating involvement of volatiles may be needed to confirm that only sensory receptors override the kin recognition process in plants. Interestingly, it is also known that changes in root interactions may also impact on shoot plasticity (Dudley & File, 2007; Biedrzycki et al., 2010), so it would be interesting to do the same experiments described in Crepy & Casal under root interaction environments. The implications of the work done by Crepy & Casal are multi-fold as it would be very important for commercial agricultural settings, where similar genotype species are grown in close proximity and may have tradeoffs which may ultimately impact overall productivity. H.P.B. thanks Dr Carla Spence for helpful comments on the draft of this manuscript." @default.
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• W2167408925 date "2014-11-26" @default.
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• W2167408925 title "Shedding light on kin recognition response in plants" @default.
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